Patchwork [v4,2/3] i2c-mpc: add support for the MPC512x processors from Freescale

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Submitter Wolfgang Grandegger
Date Jan. 28, 2010, 1:25 p.m.
Message ID <1264685141-26391-3-git-send-email-wg@grandegger.com>
Download mbox | patch
Permalink /patch/43860/
State Superseded
Headers show

Comments

Wolfgang Grandegger - Jan. 28, 2010, 1:25 p.m.
From: Wolfgang Grandegger <wg@denx.de>

The "setclock" initialization functions have been renamed to "setup"
because I2C interrupts must be enabled for the MPC512x. This requires
to handle "fsl,preserve-clocking" in a slighly different way. Also,
the old settings are now reported calling dev_dbg(). For the MPC512x
the clock setup function of the MPC52xx can be re-used. Furthermore,
the Kconfig help has been updated and corrected.

Signed-off-by: Wolfgang Grandegger <wg@denx.de>
---
 drivers/i2c/busses/Kconfig   |    7 +-
 drivers/i2c/busses/i2c-mpc.c |  127 ++++++++++++++++++++++++++++++------------
 2 files changed, 94 insertions(+), 40 deletions(-)
Wolfram Sang - Jan. 29, 2010, 4:24 p.m.
On Thu, Jan 28, 2010 at 02:25:40PM +0100, Wolfgang Grandegger wrote:
> From: Wolfgang Grandegger <wg@denx.de>
> 
> The "setclock" initialization functions have been renamed to "setup"
> because I2C interrupts must be enabled for the MPC512x. This requires
> to handle "fsl,preserve-clocking" in a slighly different way. Also,
> the old settings are now reported calling dev_dbg(). For the MPC512x
> the clock setup function of the MPC52xx can be re-used. Furthermore,
> the Kconfig help has been updated and corrected.
> 
> Signed-off-by: Wolfgang Grandegger <wg@denx.de>

One minor thing and you can add my

Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>

> ---
>  drivers/i2c/busses/Kconfig   |    7 +-
>  drivers/i2c/busses/i2c-mpc.c |  127 ++++++++++++++++++++++++++++++------------
>  2 files changed, 94 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 5f318ce..5477e41 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -418,13 +418,12 @@ config I2C_IXP2000
>  	  instead.
>  
>  config I2C_MPC
> -	tristate "MPC107/824x/85xx/52xx/86xx"
> +	tristate "MPC107/824x/85xx/512x/52xx/83xx/86xx"
>  	depends on PPC32
>  	help
>  	  If you say yes to this option, support will be included for the
> -	  built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245 and
> -	  MPC85xx/MPC8641 family processors. The driver may also work on 52xx
> -	  family processors, though interrupts are known not to work.
> +	  built-in I2C interface on the MPC107, Tsi107, MPC512x, MPC52xx,
> +	  MPC8240, MPC8245, MPC83xx, MPC85xx and MPC8641 family processors.
>  
>  	  This driver can also be built as a module.  If so, the module
>  	  will be called i2c-mpc.
> diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
> index 275ebe6..1af0730 100644
> --- a/drivers/i2c/busses/i2c-mpc.c
> +++ b/drivers/i2c/busses/i2c-mpc.c
> @@ -31,6 +31,9 @@
>  
>  #define DRV_NAME "mpc-i2c"
>  
> +#define MPC_I2C_CLOCK_SAFE     0

For clarity, I think this define should also be used when checking for the
condition (instead of using !clock).

> +#define MPC_I2C_CLOCK_PRESERVE (~0U)
> +
>  #define MPC_I2C_FDR   0x04
>  #define MPC_I2C_CR    0x08
>  #define MPC_I2C_SR    0x0c
> @@ -67,9 +70,8 @@ struct mpc_i2c_divider {
>  };
>  
>  struct mpc_i2c_data {
> -	void (*setclock)(struct device_node *node,
> -			 struct mpc_i2c *i2c,
> -			 u32 clock, u32 prescaler);
> +	void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
> +		      u32 clock, u32 prescaler);
>  	u32 prescaler;
>  };
>  
> @@ -164,7 +166,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PPC_MPC52xx
> +#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
>  static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
>  	{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
>  	{28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
> @@ -216,12 +218,18 @@ static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
>  	return div ? (int)div->fdr : -EINVAL;
>  }
>  
> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
> -					    struct mpc_i2c *i2c,
> -					    u32 clock, u32 prescaler)
> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
>  {
>  	int ret, fdr;
>  
> +	if (clock == MPC_I2C_CLOCK_PRESERVE) {
> +		dev_dbg(i2c->dev, "using fdr %d\n",
> +			readb(i2c->base + MPC_I2C_FDR));
> +		return;
> +	}
> +
>  	ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
>  	fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
>  
> @@ -230,13 +238,49 @@ static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
>  	if (ret >= 0)
>  		dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
>  }
> -#else /* !CONFIG_PPC_MPC52xx */
> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
> -					    struct mpc_i2c *i2c,
> -					    u32 clock, u32 prescaler)
> +#else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */
> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
> +{
> +}
> +#endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */
> +
> +#ifdef CONFIG_PPC_MPC512x
> +static void __devinit mpc_i2c_setup_512x(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
> +{
> +	struct device_node *node_ctrl;
> +	void __iomem *ctrl;
> +	const u32 *pval;
> +	u32 idx;
> +
> +	/* Enable I2C interrupts for mpc5121 */
> +	node_ctrl = of_find_compatible_node(NULL, NULL,
> +					    "fsl,mpc5121-i2c-ctrl");
> +	if (node_ctrl) {
> +		ctrl = of_iomap(node_ctrl, 0);
> +		if (ctrl) {
> +			/* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */
> +			pval = of_get_property(node, "reg", NULL);
> +			idx = (*pval & 0xff) / 0x20;
> +			setbits32(ctrl, 1 << (24 + idx * 2));
> +			iounmap(ctrl);
> +		}
> +		of_node_put(node_ctrl);
> +	}
> +
> +	/* The clock setup for the 52xx works also fine for the 512x */
> +	mpc_i2c_setup_52xx(node, i2c, clock, prescaler);
> +}
> +#else /* CONFIG_PPC_MPC512x */
> +static void __devinit mpc_i2c_setup_512x(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
>  {
>  }
> -#endif /* CONFIG_PPC_MPC52xx*/
> +#endif /* CONFIG_PPC_MPC512x */
>  
>  #ifdef CONFIG_FSL_SOC
>  static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
> @@ -322,12 +366,19 @@ static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
>  	return div ? (int)div->fdr : -EINVAL;
>  }
>  
> -static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
> -					    struct mpc_i2c *i2c,
> -					    u32 clock, u32 prescaler)
> +static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
>  {
>  	int ret, fdr;
>  
> +	if (clock == MPC_I2C_CLOCK_PRESERVE) {
> +		dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n",
> +			readb(i2c->base + MPC_I2C_DFSRR),
> +			readb(i2c->base + MPC_I2C_FDR));
> +		return;
> +	}
> +
>  	ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
>  	fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
>  
> @@ -340,9 +391,9 @@ static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
>  }
>  
>  #else /* !CONFIG_FSL_SOC */
> -static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
> -					    struct mpc_i2c *i2c,
> -					    u32 clock, u32 prescaler)
> +static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
>  {
>  }
>  #endif /* CONFIG_FSL_SOC */
> @@ -496,7 +547,7 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
>  {
>  	struct mpc_i2c *i2c;
>  	const u32 *prop;
> -	u32 clock = 0;
> +	u32 clock = MPC_I2C_CLOCK_SAFE;
>  	int result = 0;
>  	int plen;
>  
> @@ -525,21 +576,21 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
>  		}
>  	}
>  
> -	if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
> +	if (of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
> +		clock = MPC_I2C_CLOCK_PRESERVE;
> +	} else {
>  		prop = of_get_property(op->node, "clock-frequency", &plen);
>  		if (prop && plen == sizeof(u32))
>  			clock = *prop;
> +	}
>  
> -		if (match->data) {
> -			struct mpc_i2c_data *data =
> -				(struct mpc_i2c_data *)match->data;
> -			data->setclock(op->node, i2c, clock, data->prescaler);
> -		} else {
> -			/* Backwards compatibility */
> -			if (of_get_property(op->node, "dfsrr", NULL))
> -				mpc_i2c_setclock_8xxx(op->node, i2c,
> -						      clock, 0);
> -		}
> +	if (match->data) {
> +		struct mpc_i2c_data *data = match->data;
> +		data->setup(op->node, i2c, clock, data->prescaler);
> +	} else {
> +		/* Backwards compatibility */
> +		if (of_get_property(op->node, "dfsrr", NULL))
> +			mpc_i2c_setup_8xxx(op->node, i2c, clock, 0);
>  	}
>  
>  	dev_set_drvdata(&op->dev, i2c);
> @@ -584,21 +635,25 @@ static int __devexit fsl_i2c_remove(struct of_device *op)
>  	return 0;
>  };
>  
> +static struct mpc_i2c_data __devinitdata mpc_i2c_data_512x = {
> +	.setup = mpc_i2c_setup_512x,
> +};
> +
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_52xx = {
> -	.setclock = mpc_i2c_setclock_52xx,
> +	.setup = mpc_i2c_setup_52xx,
>  };
>  
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8313 = {
> -	.setclock = mpc_i2c_setclock_8xxx,
> +	.setup = mpc_i2c_setup_8xxx,
>  };
>  
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8543 = {
> -	.setclock = mpc_i2c_setclock_8xxx,
> +	.setup = mpc_i2c_setup_8xxx,
>  	.prescaler = 2,
>  };
>  
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8544 = {
> -	.setclock = mpc_i2c_setclock_8xxx,
> +	.setup = mpc_i2c_setup_8xxx,
>  	.prescaler = 3,
>  };
>  
> @@ -606,6 +661,7 @@ static const struct of_device_id mpc_i2c_of_match[] = {
>  	{.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
>  	{.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
>  	{.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
> +	{.compatible = "fsl,mpc5121-i2c", .data = &mpc_i2c_data_512x, },
>  	{.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
>  	{.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
>  	{.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
> @@ -615,7 +671,6 @@ static const struct of_device_id mpc_i2c_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
>  
> -
>  /* Structure for a device driver */
>  static struct of_platform_driver mpc_i2c_driver = {
>  	.match_table	= mpc_i2c_of_match,
> @@ -648,5 +703,5 @@ module_exit(fsl_i2c_exit);
>  
>  MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
>  MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
> -		   "MPC824x/85xx/52xx processors");
> +		   "MPC824x/85xx/512x/52xx processors");
>  MODULE_LICENSE("GPL");
> -- 
> 1.6.2.5
> 
> --
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Grant Likely - Feb. 9, 2010, 5:45 p.m.
On Thu, Jan 28, 2010 at 6:25 AM, Wolfgang Grandegger <wg@grandegger.com> wrote:
> From: Wolfgang Grandegger <wg@denx.de>
>
> The "setclock" initialization functions have been renamed to "setup"
> because I2C interrupts must be enabled for the MPC512x. This requires
> to handle "fsl,preserve-clocking" in a slighly different way. Also,
> the old settings are now reported calling dev_dbg(). For the MPC512x
> the clock setup function of the MPC52xx can be re-used. Furthermore,
> the Kconfig help has been updated and corrected.

Please split the rename portion into a separate patch.

Otherwise this looks pretty okay.
g.

>
> Signed-off-by: Wolfgang Grandegger <wg@denx.de>
> ---
>  drivers/i2c/busses/Kconfig   |    7 +-
>  drivers/i2c/busses/i2c-mpc.c |  127 ++++++++++++++++++++++++++++++------------
>  2 files changed, 94 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 5f318ce..5477e41 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -418,13 +418,12 @@ config I2C_IXP2000
>          instead.
>
>  config I2C_MPC
> -       tristate "MPC107/824x/85xx/52xx/86xx"
> +       tristate "MPC107/824x/85xx/512x/52xx/83xx/86xx"
>        depends on PPC32
>        help
>          If you say yes to this option, support will be included for the
> -         built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245 and
> -         MPC85xx/MPC8641 family processors. The driver may also work on 52xx
> -         family processors, though interrupts are known not to work.
> +         built-in I2C interface on the MPC107, Tsi107, MPC512x, MPC52xx,
> +         MPC8240, MPC8245, MPC83xx, MPC85xx and MPC8641 family processors.
>
>          This driver can also be built as a module.  If so, the module
>          will be called i2c-mpc.
> diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
> index 275ebe6..1af0730 100644
> --- a/drivers/i2c/busses/i2c-mpc.c
> +++ b/drivers/i2c/busses/i2c-mpc.c
> @@ -31,6 +31,9 @@
>
>  #define DRV_NAME "mpc-i2c"
>
> +#define MPC_I2C_CLOCK_SAFE     0
> +#define MPC_I2C_CLOCK_PRESERVE (~0U)
> +
>  #define MPC_I2C_FDR   0x04
>  #define MPC_I2C_CR    0x08
>  #define MPC_I2C_SR    0x0c
> @@ -67,9 +70,8 @@ struct mpc_i2c_divider {
>  };
>
>  struct mpc_i2c_data {
> -       void (*setclock)(struct device_node *node,
> -                        struct mpc_i2c *i2c,
> -                        u32 clock, u32 prescaler);
> +       void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
> +                     u32 clock, u32 prescaler);
>        u32 prescaler;
>  };
>
> @@ -164,7 +166,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
>        return 0;
>  }
>
> -#ifdef CONFIG_PPC_MPC52xx
> +#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
>  static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
>        {20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
>        {28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
> @@ -216,12 +218,18 @@ static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
>        return div ? (int)div->fdr : -EINVAL;
>  }
>
> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
> -                                           struct mpc_i2c *i2c,
> -                                           u32 clock, u32 prescaler)
> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
> +                                        struct mpc_i2c *i2c,
> +                                        u32 clock, u32 prescaler)
>  {
>        int ret, fdr;
>
> +       if (clock == MPC_I2C_CLOCK_PRESERVE) {
> +               dev_dbg(i2c->dev, "using fdr %d\n",
> +                       readb(i2c->base + MPC_I2C_FDR));
> +               return;
> +       }
> +
>        ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
>        fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
>
> @@ -230,13 +238,49 @@ static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
>        if (ret >= 0)
>                dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
>  }
> -#else /* !CONFIG_PPC_MPC52xx */
> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
> -                                           struct mpc_i2c *i2c,
> -                                           u32 clock, u32 prescaler)
> +#else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */
> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
> +                                        struct mpc_i2c *i2c,
> +                                        u32 clock, u32 prescaler)
> +{
> +}
> +#endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */
> +
> +#ifdef CONFIG_PPC_MPC512x
> +static void __devinit mpc_i2c_setup_512x(struct device_node *node,
> +                                        struct mpc_i2c *i2c,
> +                                        u32 clock, u32 prescaler)
> +{
> +       struct device_node *node_ctrl;
> +       void __iomem *ctrl;
> +       const u32 *pval;
> +       u32 idx;
> +
> +       /* Enable I2C interrupts for mpc5121 */
> +       node_ctrl = of_find_compatible_node(NULL, NULL,
> +                                           "fsl,mpc5121-i2c-ctrl");
> +       if (node_ctrl) {
> +               ctrl = of_iomap(node_ctrl, 0);
> +               if (ctrl) {
> +                       /* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */
> +                       pval = of_get_property(node, "reg", NULL);
> +                       idx = (*pval & 0xff) / 0x20;
> +                       setbits32(ctrl, 1 << (24 + idx * 2));
> +                       iounmap(ctrl);
> +               }
> +               of_node_put(node_ctrl);
> +       }
> +
> +       /* The clock setup for the 52xx works also fine for the 512x */
> +       mpc_i2c_setup_52xx(node, i2c, clock, prescaler);
> +}
> +#else /* CONFIG_PPC_MPC512x */
> +static void __devinit mpc_i2c_setup_512x(struct device_node *node,
> +                                        struct mpc_i2c *i2c,
> +                                        u32 clock, u32 prescaler)
>  {
>  }
> -#endif /* CONFIG_PPC_MPC52xx*/
> +#endif /* CONFIG_PPC_MPC512x */
>
>  #ifdef CONFIG_FSL_SOC
>  static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
> @@ -322,12 +366,19 @@ static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
>        return div ? (int)div->fdr : -EINVAL;
>  }
>
> -static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
> -                                           struct mpc_i2c *i2c,
> -                                           u32 clock, u32 prescaler)
> +static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
> +                                        struct mpc_i2c *i2c,
> +                                        u32 clock, u32 prescaler)
>  {
>        int ret, fdr;
>
> +       if (clock == MPC_I2C_CLOCK_PRESERVE) {
> +               dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n",
> +                       readb(i2c->base + MPC_I2C_DFSRR),
> +                       readb(i2c->base + MPC_I2C_FDR));
> +               return;
> +       }
> +
>        ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
>        fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
>
> @@ -340,9 +391,9 @@ static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
>  }
>
>  #else /* !CONFIG_FSL_SOC */
> -static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
> -                                           struct mpc_i2c *i2c,
> -                                           u32 clock, u32 prescaler)
> +static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
> +                                        struct mpc_i2c *i2c,
> +                                        u32 clock, u32 prescaler)
>  {
>  }
>  #endif /* CONFIG_FSL_SOC */
> @@ -496,7 +547,7 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
>  {
>        struct mpc_i2c *i2c;
>        const u32 *prop;
> -       u32 clock = 0;
> +       u32 clock = MPC_I2C_CLOCK_SAFE;
>        int result = 0;
>        int plen;
>
> @@ -525,21 +576,21 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
>                }
>        }
>
> -       if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
> +       if (of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
> +               clock = MPC_I2C_CLOCK_PRESERVE;
> +       } else {
>                prop = of_get_property(op->node, "clock-frequency", &plen);
>                if (prop && plen == sizeof(u32))
>                        clock = *prop;
> +       }
>
> -               if (match->data) {
> -                       struct mpc_i2c_data *data =
> -                               (struct mpc_i2c_data *)match->data;
> -                       data->setclock(op->node, i2c, clock, data->prescaler);
> -               } else {
> -                       /* Backwards compatibility */
> -                       if (of_get_property(op->node, "dfsrr", NULL))
> -                               mpc_i2c_setclock_8xxx(op->node, i2c,
> -                                                     clock, 0);
> -               }
> +       if (match->data) {
> +               struct mpc_i2c_data *data = match->data;
> +               data->setup(op->node, i2c, clock, data->prescaler);
> +       } else {
> +               /* Backwards compatibility */
> +               if (of_get_property(op->node, "dfsrr", NULL))
> +                       mpc_i2c_setup_8xxx(op->node, i2c, clock, 0);
>        }
>
>        dev_set_drvdata(&op->dev, i2c);
> @@ -584,21 +635,25 @@ static int __devexit fsl_i2c_remove(struct of_device *op)
>        return 0;
>  };
>
> +static struct mpc_i2c_data __devinitdata mpc_i2c_data_512x = {
> +       .setup = mpc_i2c_setup_512x,
> +};
> +
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_52xx = {
> -       .setclock = mpc_i2c_setclock_52xx,
> +       .setup = mpc_i2c_setup_52xx,
>  };
>
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8313 = {
> -       .setclock = mpc_i2c_setclock_8xxx,
> +       .setup = mpc_i2c_setup_8xxx,
>  };
>
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8543 = {
> -       .setclock = mpc_i2c_setclock_8xxx,
> +       .setup = mpc_i2c_setup_8xxx,
>        .prescaler = 2,
>  };
>
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8544 = {
> -       .setclock = mpc_i2c_setclock_8xxx,
> +       .setup = mpc_i2c_setup_8xxx,
>        .prescaler = 3,
>  };
>
> @@ -606,6 +661,7 @@ static const struct of_device_id mpc_i2c_of_match[] = {
>        {.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
>        {.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
>        {.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
> +       {.compatible = "fsl,mpc5121-i2c", .data = &mpc_i2c_data_512x, },
>        {.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
>        {.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
>        {.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
> @@ -615,7 +671,6 @@ static const struct of_device_id mpc_i2c_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
>
> -
>  /* Structure for a device driver */
>  static struct of_platform_driver mpc_i2c_driver = {
>        .match_table    = mpc_i2c_of_match,
> @@ -648,5 +703,5 @@ module_exit(fsl_i2c_exit);
>
>  MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
>  MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
> -                  "MPC824x/85xx/52xx processors");
> +                  "MPC824x/85xx/512x/52xx processors");
>  MODULE_LICENSE("GPL");
> --
> 1.6.2.5
>
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
>

Patch

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 5f318ce..5477e41 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -418,13 +418,12 @@  config I2C_IXP2000
 	  instead.
 
 config I2C_MPC
-	tristate "MPC107/824x/85xx/52xx/86xx"
+	tristate "MPC107/824x/85xx/512x/52xx/83xx/86xx"
 	depends on PPC32
 	help
 	  If you say yes to this option, support will be included for the
-	  built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245 and
-	  MPC85xx/MPC8641 family processors. The driver may also work on 52xx
-	  family processors, though interrupts are known not to work.
+	  built-in I2C interface on the MPC107, Tsi107, MPC512x, MPC52xx,
+	  MPC8240, MPC8245, MPC83xx, MPC85xx and MPC8641 family processors.
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-mpc.
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index 275ebe6..1af0730 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -31,6 +31,9 @@ 
 
 #define DRV_NAME "mpc-i2c"
 
+#define MPC_I2C_CLOCK_SAFE     0
+#define MPC_I2C_CLOCK_PRESERVE (~0U)
+
 #define MPC_I2C_FDR   0x04
 #define MPC_I2C_CR    0x08
 #define MPC_I2C_SR    0x0c
@@ -67,9 +70,8 @@  struct mpc_i2c_divider {
 };
 
 struct mpc_i2c_data {
-	void (*setclock)(struct device_node *node,
-			 struct mpc_i2c *i2c,
-			 u32 clock, u32 prescaler);
+	void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
+		      u32 clock, u32 prescaler);
 	u32 prescaler;
 };
 
@@ -164,7 +166,7 @@  static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
 	return 0;
 }
 
-#ifdef CONFIG_PPC_MPC52xx
+#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
 static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
 	{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
 	{28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
@@ -216,12 +218,18 @@  static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
 	return div ? (int)div->fdr : -EINVAL;
 }
 
-static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
-					    struct mpc_i2c *i2c,
-					    u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
 {
 	int ret, fdr;
 
+	if (clock == MPC_I2C_CLOCK_PRESERVE) {
+		dev_dbg(i2c->dev, "using fdr %d\n",
+			readb(i2c->base + MPC_I2C_FDR));
+		return;
+	}
+
 	ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
 	fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
 
@@ -230,13 +238,49 @@  static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
 	if (ret >= 0)
 		dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
 }
-#else /* !CONFIG_PPC_MPC52xx */
-static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
-					    struct mpc_i2c *i2c,
-					    u32 clock, u32 prescaler)
+#else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */
+static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
+{
+}
+#endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */
+
+#ifdef CONFIG_PPC_MPC512x
+static void __devinit mpc_i2c_setup_512x(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
+{
+	struct device_node *node_ctrl;
+	void __iomem *ctrl;
+	const u32 *pval;
+	u32 idx;
+
+	/* Enable I2C interrupts for mpc5121 */
+	node_ctrl = of_find_compatible_node(NULL, NULL,
+					    "fsl,mpc5121-i2c-ctrl");
+	if (node_ctrl) {
+		ctrl = of_iomap(node_ctrl, 0);
+		if (ctrl) {
+			/* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */
+			pval = of_get_property(node, "reg", NULL);
+			idx = (*pval & 0xff) / 0x20;
+			setbits32(ctrl, 1 << (24 + idx * 2));
+			iounmap(ctrl);
+		}
+		of_node_put(node_ctrl);
+	}
+
+	/* The clock setup for the 52xx works also fine for the 512x */
+	mpc_i2c_setup_52xx(node, i2c, clock, prescaler);
+}
+#else /* CONFIG_PPC_MPC512x */
+static void __devinit mpc_i2c_setup_512x(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
 {
 }
-#endif /* CONFIG_PPC_MPC52xx*/
+#endif /* CONFIG_PPC_MPC512x */
 
 #ifdef CONFIG_FSL_SOC
 static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
@@ -322,12 +366,19 @@  static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
 	return div ? (int)div->fdr : -EINVAL;
 }
 
-static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
-					    struct mpc_i2c *i2c,
-					    u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
 {
 	int ret, fdr;
 
+	if (clock == MPC_I2C_CLOCK_PRESERVE) {
+		dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n",
+			readb(i2c->base + MPC_I2C_DFSRR),
+			readb(i2c->base + MPC_I2C_FDR));
+		return;
+	}
+
 	ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
 	fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
 
@@ -340,9 +391,9 @@  static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
 }
 
 #else /* !CONFIG_FSL_SOC */
-static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
-					    struct mpc_i2c *i2c,
-					    u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
 {
 }
 #endif /* CONFIG_FSL_SOC */
@@ -496,7 +547,7 @@  static int __devinit fsl_i2c_probe(struct of_device *op,
 {
 	struct mpc_i2c *i2c;
 	const u32 *prop;
-	u32 clock = 0;
+	u32 clock = MPC_I2C_CLOCK_SAFE;
 	int result = 0;
 	int plen;
 
@@ -525,21 +576,21 @@  static int __devinit fsl_i2c_probe(struct of_device *op,
 		}
 	}
 
-	if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
+	if (of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
+		clock = MPC_I2C_CLOCK_PRESERVE;
+	} else {
 		prop = of_get_property(op->node, "clock-frequency", &plen);
 		if (prop && plen == sizeof(u32))
 			clock = *prop;
+	}
 
-		if (match->data) {
-			struct mpc_i2c_data *data =
-				(struct mpc_i2c_data *)match->data;
-			data->setclock(op->node, i2c, clock, data->prescaler);
-		} else {
-			/* Backwards compatibility */
-			if (of_get_property(op->node, "dfsrr", NULL))
-				mpc_i2c_setclock_8xxx(op->node, i2c,
-						      clock, 0);
-		}
+	if (match->data) {
+		struct mpc_i2c_data *data = match->data;
+		data->setup(op->node, i2c, clock, data->prescaler);
+	} else {
+		/* Backwards compatibility */
+		if (of_get_property(op->node, "dfsrr", NULL))
+			mpc_i2c_setup_8xxx(op->node, i2c, clock, 0);
 	}
 
 	dev_set_drvdata(&op->dev, i2c);
@@ -584,21 +635,25 @@  static int __devexit fsl_i2c_remove(struct of_device *op)
 	return 0;
 };
 
+static struct mpc_i2c_data __devinitdata mpc_i2c_data_512x = {
+	.setup = mpc_i2c_setup_512x,
+};
+
 static struct mpc_i2c_data __devinitdata mpc_i2c_data_52xx = {
-	.setclock = mpc_i2c_setclock_52xx,
+	.setup = mpc_i2c_setup_52xx,
 };
 
 static struct mpc_i2c_data __devinitdata mpc_i2c_data_8313 = {
-	.setclock = mpc_i2c_setclock_8xxx,
+	.setup = mpc_i2c_setup_8xxx,
 };
 
 static struct mpc_i2c_data __devinitdata mpc_i2c_data_8543 = {
-	.setclock = mpc_i2c_setclock_8xxx,
+	.setup = mpc_i2c_setup_8xxx,
 	.prescaler = 2,
 };
 
 static struct mpc_i2c_data __devinitdata mpc_i2c_data_8544 = {
-	.setclock = mpc_i2c_setclock_8xxx,
+	.setup = mpc_i2c_setup_8xxx,
 	.prescaler = 3,
 };
 
@@ -606,6 +661,7 @@  static const struct of_device_id mpc_i2c_of_match[] = {
 	{.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
 	{.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
 	{.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
+	{.compatible = "fsl,mpc5121-i2c", .data = &mpc_i2c_data_512x, },
 	{.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
 	{.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
 	{.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
@@ -615,7 +671,6 @@  static const struct of_device_id mpc_i2c_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
 
-
 /* Structure for a device driver */
 static struct of_platform_driver mpc_i2c_driver = {
 	.match_table	= mpc_i2c_of_match,
@@ -648,5 +703,5 @@  module_exit(fsl_i2c_exit);
 
 MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
 MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
-		   "MPC824x/85xx/52xx processors");
+		   "MPC824x/85xx/512x/52xx processors");
 MODULE_LICENSE("GPL");