[U-Boot,3/8] clk: rockchip: Add rv1108 Saradc clock support

[Philipp Tomsich]

On Wed, 13 Sep 2017, David Wu wrote:

> Signed-off-by: David Wu <david.wu at rock-chips.com>

Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>

> ---
> arch/arm/include/asm/arch-rockchip/cru_rv1108.h |  5 ++++
> drivers/clk/rockchip/clk_rv1108.c               | 35 +++++++++++++++++++++++++
> include/dt-bindings/clock/rv1108-cru.h          |  2 ++
> 3 files changed, 42 insertions(+)
>
> diff --git a/arch/arm/include/asm/arch-rockchip/cru_rv1108.h b/arch/arm/include/asm/arch-rockchip/cru_rv1108.h
> index 2a1ae69..b134559 100644
> --- a/arch/arm/include/asm/arch-rockchip/cru_rv1108.h
> +++ b/arch/arm/include/asm/arch-rockchip/cru_rv1108.h
> @@ -90,6 +90,11 @@ enum {
> 	CORE_CLK_DIV_SHIFT	= 0,
> 	CORE_CLK_DIV_MASK	= 0x1f << CORE_CLK_DIV_SHIFT,
>
> +	/* CLKSEL_CON22 */
> +	CLK_SARADC_DIV_CON_SHIFT= 0,
> +	CLK_SARADC_DIV_CON_MASK	= 0x3ff << CLK_SARADC_DIV_CON_SHIFT,

Can we use GENMASK here?

> +	CLK_SARADC_DIV_CON_WIDTH= 10,
> +
> 	/* CLKSEL24_CON */
> 	MAC_PLL_SEL_SHIFT	= 12,
> 	MAC_PLL_SEL_MASK	= 1 << MAC_PLL_SEL_SHIFT,
> diff --git a/drivers/clk/rockchip/clk_rv1108.c b/drivers/clk/rockchip/clk_rv1108.c
> index cf966bb..aa989c6 100644
> --- a/drivers/clk/rockchip/clk_rv1108.c
> +++ b/drivers/clk/rockchip/clk_rv1108.c
> @@ -36,6 +36,11 @@ enum {
> 			 #hz "Hz cannot be hit with PLL "\
> 			 "divisors on line " __stringify(__LINE__));
>
> +static inline u32 extract_bits(u32 val, unsigned width, unsigned shift)
> +{
> +	return (val >> shift) & ((1 << width) - 1);

The comment regarding bitfield.h applies again.

> +}
> +
> /* use interge mode*/

typo: integer

> static inline int rv1108_pll_id(enum rk_clk_id clk_id)
> {
> @@ -130,6 +135,31 @@ static int rv1108_sfc_set_clk(struct rv1108_cru *cru, uint rate)
> 	return DIV_TO_RATE(pll_rate, div);
> }
>
> +static ulong rv1108_saradc_get_clk(struct rv1108_cru *cru)
> +{
> +	u32 div, val;
> +
> +	val = readl(&cru->clksel_con[22]);
> +	div = extract_bits(val, CLK_SARADC_DIV_CON_WIDTH,
> +			   CLK_SARADC_DIV_CON_SHIFT);
> +
> +	return DIV_TO_RATE(OSC_HZ, div);
> +}
> +
> +static ulong rv1108_saradc_set_clk(struct rv1108_cru *cru, uint hz)
> +{
> +	int src_clk_div;
> +
> +	src_clk_div = DIV_ROUND_UP(OSC_HZ, hz) - 1;
> +	assert(src_clk_div < 128);
> +
> +	rk_clrsetreg(&cru->clksel_con[22],
> +		     CLK_SARADC_DIV_CON_MASK,
> +		     src_clk_div << CLK_SARADC_DIV_CON_SHIFT);
> +
> +	return rv1108_saradc_get_clk(cru);
> +}
> +
> static ulong rv1108_clk_get_rate(struct clk *clk)
> {
> 	struct rv1108_clk_priv *priv = dev_get_priv(clk->dev);
> @@ -137,6 +167,8 @@ static ulong rv1108_clk_get_rate(struct clk *clk)
> 	switch (clk->id) {
> 	case 0 ... 63:
> 		return rkclk_pll_get_rate(priv->cru, clk->id);
> +	case SCLK_SARADC:
> +		return rv1108_saradc_get_clk(priv->cru);
> 	default:
> 		return -ENOENT;
> 	}
> @@ -154,6 +186,9 @@ static ulong rv1108_clk_set_rate(struct clk *clk, ulong rate)
> 	case SCLK_SFC:
> 		new_rate = rv1108_sfc_set_clk(priv->cru, rate);
> 		break;
> +	case SCLK_SARADC:
> +		new_rate = rv1108_saradc_set_clk(priv->cru, rate);
> +		break;
> 	default:
> 		return -ENOENT;
> 	}
> diff --git a/include/dt-bindings/clock/rv1108-cru.h b/include/dt-bindings/clock/rv1108-cru.h
> index d2ad3bb..7defc6b 100644
> --- a/include/dt-bindings/clock/rv1108-cru.h
> +++ b/include/dt-bindings/clock/rv1108-cru.h
> @@ -39,6 +39,7 @@
> #define SCLK_MAC_TX			88
> #define SCLK_MACREF			89
> #define SCLK_MACREF_OUT			90
> +#define SCLK_SARADC			91
>
>
> /* aclk gates */
> @@ -67,6 +68,7 @@
> #define PCLK_TIMER			270
> #define PCLK_PERI			271
> #define PCLK_GMAC			272
> +#define PCLK_SARADC			273
>
> /* hclk gates */
> #define HCLK_I2S0_8CH			320
>