| Message ID | 1482833066-29291-8-git-send-email-peng.fan@nxp.com |
|---|---|
| State | Changes Requested |
| Delegated to: | Stefano Babic |
| Headers | show |
On 27/12/2016 11:04, Peng Fan wrote: > From: Ye Li <ye.li@nxp.com> > > Implement the i2c clock enable and get function for mx7ulp. These > functions are required by imx_lpi2c driver. > > Signed-off-by: Peng Fan <peng.fan@nxp.com> > Signed-off-by: Ye Li <ye.li@nxp.com> > Cc: Stefano Babic <sbabic@denx.de> > --- > > V2: > None > > arch/arm/cpu/armv7/mx7ulp/clock.c | 40 ++++++++++++++++++++++++++++++++ > arch/arm/include/asm/arch-mx7ulp/clock.h | 4 ++++ > 2 files changed, 44 insertions(+) > > diff --git a/arch/arm/cpu/armv7/mx7ulp/clock.c b/arch/arm/cpu/armv7/mx7ulp/clock.c > index 0c34d88..30db67d 100644 > --- a/arch/arm/cpu/armv7/mx7ulp/clock.c > +++ b/arch/arm/cpu/armv7/mx7ulp/clock.c > @@ -73,6 +73,46 @@ u32 get_lpuart_clk(void) > return pcc_clock_get_rate(lpuart_pcc_clks[index - 4]); > } > > +#ifdef CONFIG_SYS_LPI2C_IMX > +int enable_i2c_clk(unsigned char enable, unsigned i2c_num) > +{ > + /* Set parent to FIRC DIV2 clock */ > + const enum pcc_clk lpi2c_pcc_clks[] = { > + PER_CLK_LPI2C4, > + PER_CLK_LPI2C5, > + PER_CLK_LPI2C6, > + PER_CLK_LPI2C7, > + }; > + > + if (i2c_num < 4 || i2c_num > 7) > + return -EINVAL; > + > + if (enable) { > + pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4], false); > + pcc_clock_sel(lpi2c_pcc_clks[i2c_num - 4], SCG_FIRC_DIV2_CLK); > + pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4], true); > + } else { > + pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4], false); > + } > + return 0; > +} > + > +u32 imx_get_i2cclk(unsigned i2c_num) > +{ > + const enum pcc_clk lpi2c_pcc_clks[] = { > + PER_CLK_LPI2C4, > + PER_CLK_LPI2C5, > + PER_CLK_LPI2C6, > + PER_CLK_LPI2C7, > + }; > + > + if (i2c_num < 4 || i2c_num > 7) > + return 0; > + > + return pcc_clock_get_rate(lpi2c_pcc_clks[i2c_num - 4]); > +} > +#endif > + > unsigned int mxc_get_clock(enum mxc_clock clk) > { > switch (clk) { > diff --git a/arch/arm/include/asm/arch-mx7ulp/clock.h b/arch/arm/include/asm/arch-mx7ulp/clock.h > index f21052e..ebf32c6 100644 > --- a/arch/arm/include/asm/arch-mx7ulp/clock.h > +++ b/arch/arm/include/asm/arch-mx7ulp/clock.h > @@ -27,6 +27,10 @@ enum mxc_clock { > > u32 mxc_get_clock(enum mxc_clock clk); > u32 get_lpuart_clk(void); > +#ifdef CONFIG_SYS_LPI2C_IMX > +int enable_i2c_clk(unsigned char enable, unsigned i2c_num); > +u32 imx_get_i2cclk(unsigned i2c_num); > +#endif > #ifdef CONFIG_MXC_OCOTP > void enable_ocotp_clk(unsigned char enable); > #endif > Reviewed-by : Stefano Babic <sbabic@denx.de> Best regards, Stefano Babic
diff --git a/arch/arm/cpu/armv7/mx7ulp/clock.c b/arch/arm/cpu/armv7/mx7ulp/clock.c index 0c34d88..30db67d 100644 --- a/arch/arm/cpu/armv7/mx7ulp/clock.c +++ b/arch/arm/cpu/armv7/mx7ulp/clock.c @@ -73,6 +73,46 @@ u32 get_lpuart_clk(void) return pcc_clock_get_rate(lpuart_pcc_clks[index - 4]); } +#ifdef CONFIG_SYS_LPI2C_IMX +int enable_i2c_clk(unsigned char enable, unsigned i2c_num) +{ + /* Set parent to FIRC DIV2 clock */ + const enum pcc_clk lpi2c_pcc_clks[] = { + PER_CLK_LPI2C4, + PER_CLK_LPI2C5, + PER_CLK_LPI2C6, + PER_CLK_LPI2C7, + }; + + if (i2c_num < 4 || i2c_num > 7) + return -EINVAL; + + if (enable) { + pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4], false); + pcc_clock_sel(lpi2c_pcc_clks[i2c_num - 4], SCG_FIRC_DIV2_CLK); + pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4], true); + } else { + pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4], false); + } + return 0; +} + +u32 imx_get_i2cclk(unsigned i2c_num) +{ + const enum pcc_clk lpi2c_pcc_clks[] = { + PER_CLK_LPI2C4, + PER_CLK_LPI2C5, + PER_CLK_LPI2C6, + PER_CLK_LPI2C7, + }; + + if (i2c_num < 4 || i2c_num > 7) + return 0; + + return pcc_clock_get_rate(lpi2c_pcc_clks[i2c_num - 4]); +} +#endif + unsigned int mxc_get_clock(enum mxc_clock clk) { switch (clk) { diff --git a/arch/arm/include/asm/arch-mx7ulp/clock.h b/arch/arm/include/asm/arch-mx7ulp/clock.h index f21052e..ebf32c6 100644 --- a/arch/arm/include/asm/arch-mx7ulp/clock.h +++ b/arch/arm/include/asm/arch-mx7ulp/clock.h @@ -27,6 +27,10 @@ enum mxc_clock { u32 mxc_get_clock(enum mxc_clock clk); u32 get_lpuart_clk(void); +#ifdef CONFIG_SYS_LPI2C_IMX +int enable_i2c_clk(unsigned char enable, unsigned i2c_num); +u32 imx_get_i2cclk(unsigned i2c_num); +#endif #ifdef CONFIG_MXC_OCOTP void enable_ocotp_clk(unsigned char enable); #endif