linux-kernel - Re: [PATCH v3] hwmon: xgene: Support hwmon v2

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Date:   Fri, 13 Oct 2017 21:28:15 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Hoan Tran <hotran@....com>, Jean Delvare <jdelvare@...e.com>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        lho@....com, patches@....com
Subject: Re: [PATCH v3] hwmon: xgene: Support hwmon v2

On 10/13/2017 04:10 PM, Hoan Tran wrote:
> This patch supports xgene-hwmon v2 which uses the non-cachable memory
> as the PCC shared memory.
> 
> Signed-off-by: Hoan Tran <hotran@....com>
> ---
> v3
>   - Use local version variable
>   - Use inline calls instead of the private map function
> 
> v2
>   - Map PCC shared mem by ioremap() in case hwmon is v2
> 
>   drivers/hwmon/xgene-hwmon.c | 40 +++++++++++++++++++++++++++++++---------
>   1 file changed, 31 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/hwmon/xgene-hwmon.c b/drivers/hwmon/xgene-hwmon.c
> index 9c0dbb8..6b6c732 100644
> --- a/drivers/hwmon/xgene-hwmon.c
> +++ b/drivers/hwmon/xgene-hwmon.c
> @@ -91,6 +91,11 @@
>   #define to_xgene_hwmon_dev(cl)		\
>   	container_of(cl, struct xgene_hwmon_dev, mbox_client)
>   
> +enum xgene_hwmon_version {
> +	XGENE_HWMON_V1 = 0,
> +	XGENE_HWMON_V2 = 1,
> +};
> +
>   struct slimpro_resp_msg {
>   	u32 msg;
>   	u32 param1;
> @@ -609,6 +614,15 @@ static void xgene_hwmon_tx_done(struct mbox_client *cl, void *msg, int ret)
>   	}
>   }
>   
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id xgene_hwmon_acpi_match[] = {
> +	{"APMC0D29", XGENE_HWMON_V1},
> +	{"APMC0D8A", XGENE_HWMON_V2},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(acpi, xgene_hwmon_acpi_match);
> +#endif
> +
>   static int xgene_hwmon_probe(struct platform_device *pdev)
>   {
>   	struct xgene_hwmon_dev *ctx;
> @@ -650,6 +664,16 @@ static int xgene_hwmon_probe(struct platform_device *pdev)
>   		}
>   	} else {
>   		struct acpi_pcct_hw_reduced *cppc_ss;
> +		const struct acpi_device_id *acpi_id;
> +		int version;
> +
> +#ifdef CONFIG_ACPI
> +		acpi_id = acpi_match_device(xgene_hwmon_acpi_match, &pdev->dev);
> +		if (!acpi_id)
> +			return -EINVAL;
> +
> +		version = (int)acpi_id->driver_data;
> +#endif
>   
This leaves "version" uninitialized if CONFIG_ACPI is not defined.

Guenter

>   		if (device_property_read_u32(&pdev->dev, "pcc-channel",
>   					     &ctx->mbox_idx)) {
> @@ -690,7 +714,13 @@ static int xgene_hwmon_probe(struct platform_device *pdev)
>   		 */
>   		ctx->comm_base_addr = cppc_ss->base_address;
>   		if (ctx->comm_base_addr) {
> -			ctx->pcc_comm_addr = memremap(ctx->comm_base_addr,
> +			if (version == XGENE_HWMON_V2)
> +				ctx->pcc_comm_addr = (void __force *)ioremap(
> +							ctx->comm_base_addr,
> +							cppc_ss->length);
> +			else
> +				ctx->pcc_comm_addr = memremap(
> +							ctx->comm_base_addr,
>   							cppc_ss->length,
>   							MEMREMAP_WB);
>   		} else {
> @@ -758,14 +788,6 @@ static int xgene_hwmon_remove(struct platform_device *pdev)
>   	return 0;
>   }
>   
> -#ifdef CONFIG_ACPI
> -static const struct acpi_device_id xgene_hwmon_acpi_match[] = {
> -	{"APMC0D29", 0},
> -	{},
> -};
> -MODULE_DEVICE_TABLE(acpi, xgene_hwmon_acpi_match);
> -#endif
> -
>   static const struct of_device_id xgene_hwmon_of_match[] = {
>   	{.compatible = "apm,xgene-slimpro-hwmon"},
>   	{}
>