[v5,3/6] clk: ast2600: Add full configs for I3C clocks

The current ast2600 I3C clock definitions are top-level (rather than
based on their actual hw sources: either HCLK or APLL), and include a
couple of definitions for (non-existent) i3c6 and i3c7.

Re-parent the individual I3C controller clocks to the main i3c clock,
explicitly sourced from the APLL rather than whatever G6_CLK_SELECTION5
was last set to.

While we're at it, remove the definitions for the i3c6 and i3c7 clock
lines; this hardware isn't present.

This is a partial cherry-pick and rework of ed44b8cdfdb and 1a35eb926d7
from Aspeed's own tree, originally by Dylan Hung
<dylan_hung@aspeedtech.com>.

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>

---
v5:
 - use regmap_update_bits()
 - add comment on NUM_CLKS semantics
v4:
 - expand NUM_CLKS for the new I3C clock
v3:
 - split dt-bindings and clk changes
v2:
 - reword commit message
---
 drivers/clk/clk-ast2600.c | 43 +++++++++++++++++++++++++++++++--------
 1 file changed, 34 insertions(+), 9 deletions(-)

On Thu, 2 Mar 2023 at 00:58, Jeremy Kerr <jk@codeconstruct.com.au> wrote:
>
> The current ast2600 I3C clock definitions are top-level (rather than
> based on their actual hw sources: either HCLK or APLL), and include a
> couple of definitions for (non-existent) i3c6 and i3c7.
>
> Re-parent the individual I3C controller clocks to the main i3c clock,
> explicitly sourced from the APLL rather than whatever G6_CLK_SELECTION5
> was last set to.
>
> While we're at it, remove the definitions for the i3c6 and i3c7 clock
> lines; this hardware isn't present.
>
> This is a partial cherry-pick and rework of ed44b8cdfdb and 1a35eb926d7
> from Aspeed's own tree, originally by Dylan Hung
> <dylan_hung@aspeedtech.com>.
>
> Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>

Reviewed-by: Joel Stanley <joel@jms.id.au>

>
> ---
> v5:
>  - use regmap_update_bits()
>  - add comment on NUM_CLKS semantics
> v4:
>  - expand NUM_CLKS for the new I3C clock
> v3:
>  - split dt-bindings and clk changes
> v2:
>  - reword commit message
> ---
>  drivers/clk/clk-ast2600.c | 43 +++++++++++++++++++++++++++++++--------
>  1 file changed, 34 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/clk/clk-ast2600.c b/drivers/clk/clk-ast2600.c
> index 1f08ff3c60fa..09f26ab5f9af 100644
> --- a/drivers/clk/clk-ast2600.c
> +++ b/drivers/clk/clk-ast2600.c
> @@ -15,7 +15,11 @@
>
>  #include "clk-aspeed.h"
>
> -#define ASPEED_G6_NUM_CLKS             71
> +/*
> + * This includes the gates (configured from aspeed_g6_gates), plus the
> + * explicitly-configured clocks (ASPEED_CLK_HPLL and up).
> + */
> +#define ASPEED_G6_NUM_CLKS             72
>
>  #define ASPEED_G6_SILICON_REV          0x014
>  #define CHIP_REVISION_ID                       GENMASK(23, 16)
> @@ -32,6 +36,20 @@
>  #define ASPEED_G6_CLK_SELECTION1       0x300
>  #define ASPEED_G6_CLK_SELECTION2       0x304
>  #define ASPEED_G6_CLK_SELECTION4       0x310
> +#define ASPEED_G6_CLK_SELECTION5       0x314
> +#define   I3C_CLK_SELECTION_SHIFT      31
> +#define   I3C_CLK_SELECTION            BIT(31)
> +#define     I3C_CLK_SELECT_HCLK                (0 << I3C_CLK_SELECTION_SHIFT)
> +#define     I3C_CLK_SELECT_APLL_DIV    (1 << I3C_CLK_SELECTION_SHIFT)
> +#define   APLL_DIV_SELECTION_SHIFT     28
> +#define   APLL_DIV_SELECTION           GENMASK(30, 28)
> +#define     APLL_DIV_2                 (0b001 << APLL_DIV_SELECTION_SHIFT)
> +#define     APLL_DIV_3                 (0b010 << APLL_DIV_SELECTION_SHIFT)
> +#define     APLL_DIV_4                 (0b011 << APLL_DIV_SELECTION_SHIFT)
> +#define     APLL_DIV_5                 (0b100 << APLL_DIV_SELECTION_SHIFT)
> +#define     APLL_DIV_6                 (0b101 << APLL_DIV_SELECTION_SHIFT)
> +#define     APLL_DIV_7                 (0b110 << APLL_DIV_SELECTION_SHIFT)
> +#define     APLL_DIV_8                 (0b111 << APLL_DIV_SELECTION_SHIFT)
>
>  #define ASPEED_HPLL_PARAM              0x200
>  #define ASPEED_APLL_PARAM              0x210
> @@ -97,14 +115,13 @@ static const struct aspeed_gate_data aspeed_g6_gates[] = {
>         [ASPEED_CLK_GATE_LHCCLK]        = { 37, -1, "lhclk-gate",       "lhclk", 0 },   /* LPC master/LPC+ */
>         /* Reserved 38 RSA: no longer used */
>         /* Reserved 39 */
> -       [ASPEED_CLK_GATE_I3C0CLK]       = { 40,  40, "i3c0clk-gate",    NULL,    0 },   /* I3C0 */
> -       [ASPEED_CLK_GATE_I3C1CLK]       = { 41,  41, "i3c1clk-gate",    NULL,    0 },   /* I3C1 */
> -       [ASPEED_CLK_GATE_I3C2CLK]       = { 42,  42, "i3c2clk-gate",    NULL,    0 },   /* I3C2 */
> -       [ASPEED_CLK_GATE_I3C3CLK]       = { 43,  43, "i3c3clk-gate",    NULL,    0 },   /* I3C3 */
> -       [ASPEED_CLK_GATE_I3C4CLK]       = { 44,  44, "i3c4clk-gate",    NULL,    0 },   /* I3C4 */
> -       [ASPEED_CLK_GATE_I3C5CLK]       = { 45,  45, "i3c5clk-gate",    NULL,    0 },   /* I3C5 */
> -       [ASPEED_CLK_GATE_I3C6CLK]       = { 46,  46, "i3c6clk-gate",    NULL,    0 },   /* I3C6 */
> -       [ASPEED_CLK_GATE_I3C7CLK]       = { 47,  47, "i3c7clk-gate",    NULL,    0 },   /* I3C7 */
> +       [ASPEED_CLK_GATE_I3C0CLK]       = { 40,  40, "i3c0clk-gate",    "i3cclk", 0 }, /* I3C0 */
> +       [ASPEED_CLK_GATE_I3C1CLK]       = { 41,  41, "i3c1clk-gate",    "i3cclk", 0 }, /* I3C1 */
> +       [ASPEED_CLK_GATE_I3C2CLK]       = { 42,  42, "i3c2clk-gate",    "i3cclk", 0 }, /* I3C2 */
> +       [ASPEED_CLK_GATE_I3C3CLK]       = { 43,  43, "i3c3clk-gate",    "i3cclk", 0 }, /* I3C3 */
> +       [ASPEED_CLK_GATE_I3C4CLK]       = { 44,  44, "i3c4clk-gate",    "i3cclk", 0 }, /* I3C4 */
> +       [ASPEED_CLK_GATE_I3C5CLK]       = { 45,  45, "i3c5clk-gate",    "i3cclk", 0 }, /* I3C5 */
> +       /* Reserved: 46 & 47 */
>         [ASPEED_CLK_GATE_UART1CLK]      = { 48,  -1, "uart1clk-gate",   "uart",  0 },   /* UART1 */
>         [ASPEED_CLK_GATE_UART2CLK]      = { 49,  -1, "uart2clk-gate",   "uart",  0 },   /* UART2 */
>         [ASPEED_CLK_GATE_UART3CLK]      = { 50,  -1, "uart3clk-gate",   "uart",  0 },   /* UART3 */
> @@ -775,6 +792,14 @@ static void __init aspeed_g6_cc(struct regmap *map)
>         /* USB 2.0 port1 phy 40MHz clock */
>         hw = clk_hw_register_fixed_rate(NULL, "usb-phy-40m", NULL, 0, 40000000);
>         aspeed_g6_clk_data->hws[ASPEED_CLK_USBPHY_40M] = hw;
> +
> +       /* i3c clock: source from apll, divide by 8 */
> +       regmap_update_bits(map, ASPEED_G6_CLK_SELECTION5,
> +                          I3C_CLK_SELECTION | APLL_DIV_SELECTION,
> +                          I3C_CLK_SELECT_APLL_DIV | APLL_DIV_8);
> +
> +       hw = clk_hw_register_fixed_factor(NULL, "i3cclk", "apll", 0, 1, 8);
> +       aspeed_g6_clk_data->hws[ASPEED_CLK_I3C] = hw;
>  };
>
>  static void __init aspeed_g6_cc_init(struct device_node *np)
> --
> 2.39.1
>

Quoting Jeremy Kerr (2023-03-01 16:58:31)
> The current ast2600 I3C clock definitions are top-level (rather than
> based on their actual hw sources: either HCLK or APLL), and include a
> couple of definitions for (non-existent) i3c6 and i3c7.
> 
> Re-parent the individual I3C controller clocks to the main i3c clock,
> explicitly sourced from the APLL rather than whatever G6_CLK_SELECTION5
> was last set to.
> 
> While we're at it, remove the definitions for the i3c6 and i3c7 clock
> lines; this hardware isn't present.
> 
> This is a partial cherry-pick and rework of ed44b8cdfdb and 1a35eb926d7
> from Aspeed's own tree, originally by Dylan Hung
> <dylan_hung@aspeedtech.com>.
> 
> Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
> 
> ---

Applied to clk-next