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Message-ID: <56f4f0eb-7c6b-459a-bf90-1493e14fc106@linaro.org>
Date: Thu, 28 Mar 2024 09:54:20 +0100
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From: Neil Armstrong <neil.armstrong@linaro.org>
Reply-To: neil.armstrong@linaro.org
Subject: Re: [PATCH RESEND v6 4/5] spmi: pmic-arb: Make core resources
 acquiring a version operation
To: Abel Vesa <abel.vesa@linaro.org>, Stephen Boyd <sboyd@kernel.org>,
 Matthias Brugger <matthias.bgg@gmail.com>,
 Bjorn Andersson <andersson@kernel.org>,
 Konrad Dybcio <konrad.dybcio@linaro.org>,
 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>,
 Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>
Cc: Srini Kandagatla <srinivas.kandagatla@linaro.org>,
 Johan Hovold <johan@kernel.org>, linux-kernel@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org,
 linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org
References: <20240326-spmi-multi-master-support-v6-0-1c87d8306c5b@linaro.org>
 <20240326-spmi-multi-master-support-v6-4-1c87d8306c5b@linaro.org>
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Organization: Linaro
In-Reply-To: <20240326-spmi-multi-master-support-v6-4-1c87d8306c5b@linaro.org>
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On 26/03/2024 17:28, Abel Vesa wrote:
> Rather than setting up the core, obsrv and chnls in probe by using
> version specific conditionals, add a dedicated "get_core_resources"
> version specific op and move the acquiring in there.
> 
> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> ---
>   drivers/spmi/spmi-pmic-arb.c | 113 +++++++++++++++++++++++++++----------------
>   1 file changed, 70 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> index 38fed8a585fe..188252bfb95f 100644
> --- a/drivers/spmi/spmi-pmic-arb.c
> +++ b/drivers/spmi/spmi-pmic-arb.c
> @@ -203,6 +203,7 @@ struct spmi_pmic_arb {
>    */
>   struct pmic_arb_ver_ops {
>   	const char *ver_str;
> +	int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
>   	int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
>   	int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
>   	/* spmi commands (read_cmd, write_cmd, cmd) functionality */
> @@ -956,6 +957,19 @@ static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
>   	return 0;
>   }
>   
> +static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
> +					  void __iomem *core)
> +{
> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> +
> +	pmic_arb->wr_base = core;
> +	pmic_arb->rd_base = core;
> +
> +	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
> +
> +	return 0;
> +}
> +
>   static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
>   {
>   	u32 *mapping_table;
> @@ -1063,6 +1077,33 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
>   	return apid;
>   }
>   
> +static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
> +{
> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> +
> +	pmic_arb->rd_base = devm_platform_ioremap_resource_byname(pdev, "obsrvr");
> +	if (IS_ERR(pmic_arb->rd_base))
> +		return PTR_ERR(pmic_arb->rd_base);
> +
> +	pmic_arb->wr_base = devm_platform_ioremap_resource_byname(pdev, "chnls");
> +	if (IS_ERR(pmic_arb->wr_base))
> +		return PTR_ERR(pmic_arb->wr_base);
> +
> +	return 0;
> +}
> +
> +static int pmic_arb_get_core_resources_v2(struct platform_device *pdev,
> +					  void __iomem *core)
> +{
> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> +
> +	pmic_arb->core = core;
> +
> +	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
> +
> +	return pmic_arb_get_obsrvr_chnls_v2(pdev);
> +}
> +
>   static int pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pmic_arb, u16 ppid)
>   {
>   	u16 apid_valid;
> @@ -1246,6 +1287,18 @@ static int pmic_arb_offset_v5(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
>   	return offset;
>   }
>   
> +static int pmic_arb_get_core_resources_v7(struct platform_device *pdev,
> +					  void __iomem *core)
> +{
> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> +
> +	pmic_arb->core = core;
> +
> +	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS_V7;
> +
> +	return pmic_arb_get_obsrvr_chnls_v2(pdev);
> +}
> +
>   /*
>    * Only v7 supports 2 buses. Each bus will get a different apid count, read
>    * from different registers.
> @@ -1469,6 +1522,7 @@ pmic_arb_apid_owner_v7(struct spmi_pmic_arb *pmic_arb, u16 n)
>   
>   static const struct pmic_arb_ver_ops pmic_arb_v1 = {
>   	.ver_str		= "v1",
> +	.get_core_resources	= pmic_arb_get_core_resources_v1,
>   	.init_apid		= pmic_arb_init_apid_v1,
>   	.ppid_to_apid		= pmic_arb_ppid_to_apid_v1,
>   	.non_data_cmd		= pmic_arb_non_data_cmd_v1,
> @@ -1484,6 +1538,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v1 = {
>   
>   static const struct pmic_arb_ver_ops pmic_arb_v2 = {
>   	.ver_str		= "v2",
> +	.get_core_resources	= pmic_arb_get_core_resources_v2,
>   	.init_apid		= pmic_arb_init_apid_v1,
>   	.ppid_to_apid		= pmic_arb_ppid_to_apid_v2,
>   	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
> @@ -1499,6 +1554,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v2 = {
>   
>   static const struct pmic_arb_ver_ops pmic_arb_v3 = {
>   	.ver_str		= "v3",
> +	.get_core_resources	= pmic_arb_get_core_resources_v2,
>   	.init_apid		= pmic_arb_init_apid_v1,
>   	.ppid_to_apid		= pmic_arb_ppid_to_apid_v2,
>   	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
> @@ -1514,6 +1570,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v3 = {
>   
>   static const struct pmic_arb_ver_ops pmic_arb_v5 = {
>   	.ver_str		= "v5",
> +	.get_core_resources	= pmic_arb_get_core_resources_v2,
>   	.init_apid		= pmic_arb_init_apid_v5,
>   	.ppid_to_apid		= pmic_arb_ppid_to_apid_v5,
>   	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
> @@ -1529,6 +1586,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v5 = {
>   
>   static const struct pmic_arb_ver_ops pmic_arb_v7 = {
>   	.ver_str		= "v7",
> +	.get_core_resources	= pmic_arb_get_core_resources_v7,
>   	.init_apid		= pmic_arb_init_apid_v7,
>   	.ppid_to_apid		= pmic_arb_ppid_to_apid_v5,
>   	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
> @@ -1565,16 +1623,6 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
>   	pmic_arb = spmi_controller_get_drvdata(ctrl);
>   	pmic_arb->spmic = ctrl;
>   
> -	/*
> -	 * Please don't replace this with devm_platform_ioremap_resource() or
> -	 * devm_ioremap_resource().  These both result in a call to
> -	 * devm_request_mem_region() which prevents multiple mappings of this
> -	 * register address range.  SoCs with PMIC arbiter v7 may define two
> -	 * arbiter devices, for the two physical SPMI interfaces, which  share
> -	 * some register address ranges (i.e. "core", "obsrvr", and "chnls").
> -	 * Ensure that both devices probe successfully by calling devm_ioremap()
> -	 * which does not result in a devm_request_mem_region() call.
> -	 */

Can you explain in the commit message why you remove this comment ?

>   	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "core");
>   	core = devm_ioremap(&ctrl->dev, res->start, resource_size(res));
>   	if (IS_ERR(core))
> @@ -1584,44 +1632,23 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
>   
>   	hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
>   
> -	if (hw_ver < PMIC_ARB_VERSION_V2_MIN) {
> +	if (hw_ver < PMIC_ARB_VERSION_V2_MIN)
>   		pmic_arb->ver_ops = &pmic_arb_v1;
> -		pmic_arb->wr_base = core;
> -		pmic_arb->rd_base = core;
> -	} else {
> -		pmic_arb->core = core;
> -
> -		if (hw_ver < PMIC_ARB_VERSION_V3_MIN)
> -			pmic_arb->ver_ops = &pmic_arb_v2;
> -		else if (hw_ver < PMIC_ARB_VERSION_V5_MIN)
> -			pmic_arb->ver_ops = &pmic_arb_v3;
> -		else if (hw_ver < PMIC_ARB_VERSION_V7_MIN)
> -			pmic_arb->ver_ops = &pmic_arb_v5;
> -		else
> -			pmic_arb->ver_ops = &pmic_arb_v7;
> -
> -		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> -						   "obsrvr");
> -		pmic_arb->rd_base = devm_ioremap(&ctrl->dev, res->start,
> -						 resource_size(res));
> -		if (IS_ERR(pmic_arb->rd_base))
> -			return PTR_ERR(pmic_arb->rd_base);
> -
> -		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> -						   "chnls");
> -		pmic_arb->wr_base = devm_ioremap(&ctrl->dev, res->start,
> -						 resource_size(res));
> -		if (IS_ERR(pmic_arb->wr_base))
> -			return PTR_ERR(pmic_arb->wr_base);
> -	}
> +	else if (hw_ver < PMIC_ARB_VERSION_V3_MIN)
> +		pmic_arb->ver_ops = &pmic_arb_v2;
> +	else if (hw_ver < PMIC_ARB_VERSION_V5_MIN)
> +		pmic_arb->ver_ops = &pmic_arb_v3;
> +	else if (hw_ver < PMIC_ARB_VERSION_V7_MIN)
> +		pmic_arb->ver_ops = &pmic_arb_v5;
> +	else
> +		pmic_arb->ver_ops = &pmic_arb_v7;
>   
>   	dev_info(&ctrl->dev, "PMIC arbiter version %s (0x%x)\n",
>   		 pmic_arb->ver_ops->ver_str, hw_ver);
>   
> -	if (hw_ver < PMIC_ARB_VERSION_V7_MIN)
> -		pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
> -	else
> -		pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS_V7;
> +	err = pmic_arb->ver_ops->get_core_resources(pdev, core);
> +	if (err)
> +		return err;
>   
>   	err = pmic_arb->ver_ops->init_apid(pmic_arb, 0);
>   	if (err)
> 

With that added:

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>