[PATCH 2/2] platform: starfive: get I2C offset address from clocks property

[Xiang W]

在 2024-01-17星期三的 12:16 +0100，Nam Cao写道：
> The current code gets the I2C offset address using the device tree node
> name: it get the I2C device index from the 4th character in the node
> name (for example, "i2c5" -> i2c device 5). However, the device tree
> node's name in U-Boot is actually just "i2c" without the number, so the
> current code cannot be used with the device tree from U-Boot.
> 
> Get the I2C offset address from the "clocks" property instead.
> 
> Signed-off-by: Nam Cao <namcao at linutronix.de>
> ---
>  platform/generic/starfive/jh7110.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/platform/generic/starfive/jh7110.c b/platform/generic/starfive/jh7110.c
> index 4b22175..846b068 100644
> --- a/platform/generic/starfive/jh7110.c
> +++ b/platform/generic/starfive/jh7110.c
> @@ -29,7 +29,7 @@ struct pmic {
>  struct jh7110 {
>  	u64 pmu_reg_base;
>  	u64 clk_reg_base;
> -	u32 i2c_index;
> +	u32 i2c_clk_offset;
>  };
>  
>  static struct pmic pmic_inst;
> @@ -163,10 +163,7 @@ static void pmic_i2c_clk_enable(void)
>  	unsigned long clock_base;
>  	unsigned int val;
>  
> -	clock_base = jh7110_inst.clk_reg_base +
> -		I2C_APB_CLK_OFFSET +
The I2C_APB_CLK_OFFSET is no longer needed and can be removed.

Regards,
Xiang W
> -		(jh7110_inst.i2c_index << 2);
> -
> +	clock_base = jh7110_inst.clk_reg_base + jh7110_inst.i2c_clk_offset;
>  	val = readl((void *)clock_base);
>  
>  	if (!val)
> @@ -241,7 +238,8 @@ static struct fdt_reset fdt_reset_pmic = {
>  static int starfive_jh7110_inst_init(void *fdt)
>  {
>  	int noff, rc = 0;
> -	const char *name;
> +	const fdt32_t *val;
> +	int len;
>  	u64 addr;
>  
>  	noff = fdt_node_offset_by_compatible(fdt, -1, "starfive,jh7110-pmu");
> @@ -261,9 +259,12 @@ static int starfive_jh7110_inst_init(void *fdt)
>  	}
>  
>  	if (pmic_inst.adapter) {
> -		name = fdt_get_name(fdt, pmic_inst.adapter->id, NULL);
> -		if (!sbi_strncmp(name, "i2c", 3))
> -			jh7110_inst.i2c_index = name[3] - '0';
> +		val = fdt_getprop(fdt, pmic_inst.adapter->id, "clocks", &len);
> +		/* The clocks property looks like this: clocks = <&syscrg JH7110_SYSCLK_I2C5_APB>;
> +		 * So check that the length is 8 bytes, and get the offset from the second value
> +		 */
> +		if (val && len == 8)
> +			jh7110_inst.i2c_clk_offset = fdt32_to_cpu(val[1]) << 2;
>  		else
>  			rc = SBI_EINVAL;
>  	}
> -- 
> 2.39.2
> 
>