linux-kernel - Re: [PATCH v4 2/6] cpufreq: sun50i: add a100 cpufreq support

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Message-ID: <1e50b1d4-fc17-648f-2437-22f097868549@sholland.org>
Date:   Sun, 13 Dec 2020 18:51:16 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Shuosheng Huang <huangshuosheng@...winnertech.com>,
        tiny.windzz@...il.com, rjw@...ysocki.net, viresh.kumar@...aro.org,
        mripard@...nel.org, wens@...e.org, jernej.skrabec@...l.net
Cc:     linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/6] cpufreq: sun50i: add a100 cpufreq support

On 12/8/20 1:19 AM, Shuosheng Huang wrote:
> Add cpufreq nvmem based for allwinner a100 SoC, it's similar to h6.
> 
> Signed-off-by: Shuosheng Huang <huangshuosheng@...winnertech.com>
> ---
>  drivers/cpufreq/cpufreq-dt-platdev.c   |  1 +
>  drivers/cpufreq/sun50i-cpufreq-nvmem.c | 32 ++++++++++++++++++++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
> index 3776d960f405..2ebf5d9cb616 100644
> --- a/drivers/cpufreq/cpufreq-dt-platdev.c
> +++ b/drivers/cpufreq/cpufreq-dt-platdev.c
> @@ -102,6 +102,7 @@ static const struct of_device_id whitelist[] __initconst = {
>   */
>  static const struct of_device_id blacklist[] __initconst = {
>  	{ .compatible = "allwinner,sun50i-h6", },
> +	{ .compatible = "allwinner,sun50i-a100", },
>  
>  	{ .compatible = "calxeda,highbank", },
>  	{ .compatible = "calxeda,ecx-2000", },
> diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> index 3c0531938d1a..aead98164373 100644
> --- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> @@ -22,6 +22,9 @@
>  #define SUN50I_H6_NVMEM_MASK		0x7
>  #define SUN50I_H6_NVMEM_SHIFT		5
>  
> +#define SUN50I_A100_NVMEM_MASK		0xf
> +#define SUN50I_A100_NVMEM_SHIFT		12
> +
>  struct sunxi_cpufreq_soc_data {
>  	int (*efuse_xlate)(struct nvmem_cell *speedbin_nvmem);
>  };
> @@ -52,6 +55,30 @@ static int sun50i_h6_efuse_xlate(struct nvmem_cell *speedbin_nvmem)
>  		return 0;
>  }
>  
> +static int sun50i_a100_efuse_xlate(struct nvmem_cell *speedbin_nvmem)
> +{
> +	size_t len;
> +	u32 *speedbin;
> +	u32 efuse_value;
> +
> +	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
> +	if (IS_ERR(speedbin))
> +		return PTR_ERR(speedbin);
> +
> +	efuse_value = (*(u16 *)efuse >> SUN50I_A100_NVMEM_SHIFT) &

This does not compile. `efuse` should be `speedbin`. And please remove
the cast after fixing the types of the variables to be `u16` instead of
`u32`.

Cheers,
Samuel

> +			  SUN50I_A100_NVMEM_MASK;
> +	kfree(speedbin);
> +
> +	switch (efuse_value) {
> +	case 0b100:
> +		return 2;
> +	case 0b010:
> +		return 1;
> +	default:
> +		return 0;
> +	}
> +}
> +
>  /**
>   * sun50i_cpufreq_get_efuse() - Determine speed grade from efuse value
>   * @soc_data: pointer to sunxi_cpufreq_soc_data context
> @@ -184,8 +211,13 @@ static const struct sunxi_cpufreq_soc_data sun50i_h6_data = {
>  	.efuse_xlate = sun50i_h6_efuse_xlate,
>  };
>  
> +static const struct sunxi_cpufreq_soc_data sun50i_a100_data = {
> +	.efuse_xlate = sun50i_a100_efuse_xlate,
> +};
> +
>  static const struct of_device_id sun50i_cpufreq_match_list[] = {
>  	{ .compatible = "allwinner,sun50i-h6", .data = &sun50i_h6_data },
> +	{ .compatible = "allwinner,sun50i-a100", .data = &sun50i_a100_data },
>  	{}
>  };
>  
>