linux-kernel - Re: [PATCH v8 01/16] PCI: imx6: Simplify clock handling by using clk

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Message-ID: <20240119081700.GD2866@thinkpad>
Date: Fri, 19 Jan 2024 13:47:00 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Frank Li <Frank.Li@....com>
Cc: krzysztof.kozlowski@...aro.org, bhelgaas@...gle.com,
	conor+dt@...nel.org, devicetree@...r.kernel.org, festevam@...il.com,
	helgaas@...nel.org, hongxing.zhu@....com, imx@...ts.linux.dev,
	kernel@...gutronix.de, krzysztof.kozlowski+dt@...aro.org,
	kw@...ux.com, l.stach@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	lpieralisi@...nel.org, robh@...nel.org, s.hauer@...gutronix.de,
	shawnguo@...nel.org
Subject: Re: [PATCH v8 01/16] PCI: imx6: Simplify clock handling by using
 clk_bulk*() function

On Mon, Jan 08, 2024 at 06:21:30PM -0500, Frank Li wrote:
> Refector the clock handling logic. Add 'clk_names' define in drvdata. Use
> clk_bulk*() api simplify the code.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---

One comment below. With that addressed,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

> 
> Notes:
>     Change from v7 to v8
>     - update comment message
>     - using ARRAY_SIZE to count clk_names.
>     Change from v6 to v7
>     - none
>     Change from v4 to v5
>     - update commit message
>     - direct using clk name list, instead of macro
>     - still keep caculate clk list count because sizeof return pre allocated
>     array size.
>     
>     Change from v3 to v4
>     - using clk_bulk_*() API
>     Change from v1 to v3
>     - none
>     
>     Change from v4 to v5
>     - update commit message
>     - direct using clk name list, instead of macro
>     - still keep caculate clk list count because sizeof return pre allocated
>     array size.
>     
>     Change from v3 to v4
>     - using clk_bulk_*() API
>     Change from v1 to v3
>     - none
> 
>  drivers/pci/controller/dwc/pci-imx6.c | 144 ++++++++++----------------
>  1 file changed, 54 insertions(+), 90 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 74703362aeec7..4912c6b08ecf8 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c

[...]

>  
> +static const char * const
> +imx6_3clks_bus_pcie_phy[] = {"pcie_bus", "pcie", "pcie_phy"};
> +static const char * const
> +imx6_3clks_bus_pcie_aux[] = {"pcie_bus", "pcie", "pcie_aux"};
> +static const char * const
> +imx6_4clks_bus_pcie_phy_aux[] = {"pcie_bus", "pcie", "pcie_phy", "pcie_aux"};
> +static const char * const
> +imx6_4clks_bus_pcie_phy_axi[] = {"pcie_bus", "pcie", "pcie_phy", "pcie_inbound_axi"};
> +

Use platform names for defining the array. Like,

imx6q_clks[]
imx6sx_clks[]
imx8mq_clks[]
imx8mm_clks[]

and reuse them for other platforms as well. This gives an idea of how the clocks
got inherited from some base platforms.

- Mani

>  static const struct imx6_pcie_drvdata drvdata[] = {
>  	[IMX6Q] = {
>  		.variant = IMX6Q,
> @@ -1477,6 +1421,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
>  			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
>  		.dbi_length = 0x200,
>  		.gpr = "fsl,imx6q-iomuxc-gpr",
> +		.clk_names = imx6_3clks_bus_pcie_phy,
> +		.clks_cnt = ARRAY_SIZE(imx6_3clks_bus_pcie_phy),
>  	},
>  	[IMX6SX] = {
>  		.variant = IMX6SX,
> @@ -1484,6 +1430,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
>  			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
>  			 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
>  		.gpr = "fsl,imx6q-iomuxc-gpr",
> +		.clk_names = imx6_4clks_bus_pcie_phy_axi,
> +		.clks_cnt = ARRAY_SIZE(imx6_4clks_bus_pcie_phy_axi),
>  	},
>  	[IMX6QP] = {
>  		.variant = IMX6QP,
> @@ -1492,40 +1440,56 @@ static const struct imx6_pcie_drvdata drvdata[] = {
>  			 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
>  		.dbi_length = 0x200,
>  		.gpr = "fsl,imx6q-iomuxc-gpr",
> +		.clk_names = imx6_3clks_bus_pcie_phy,
> +		.clks_cnt = ARRAY_SIZE(imx6_3clks_bus_pcie_phy),
>  	},
>  	[IMX7D] = {
>  		.variant = IMX7D,
>  		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
>  		.gpr = "fsl,imx7d-iomuxc-gpr",
> +		.clk_names = imx6_3clks_bus_pcie_phy,
> +		.clks_cnt = ARRAY_SIZE(imx6_3clks_bus_pcie_phy),
>  	},
>  	[IMX8MQ] = {
>  		.variant = IMX8MQ,
>  		.gpr = "fsl,imx8mq-iomuxc-gpr",
> +		.clk_names = imx6_4clks_bus_pcie_phy_aux,
> +		.clks_cnt = ARRAY_SIZE(imx6_4clks_bus_pcie_phy_aux),
>  	},
>  	[IMX8MM] = {
>  		.variant = IMX8MM,
>  		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
>  		.gpr = "fsl,imx8mm-iomuxc-gpr",
> +		.clk_names = imx6_3clks_bus_pcie_aux,
> +		.clks_cnt = ARRAY_SIZE(imx6_3clks_bus_pcie_aux),
>  	},
>  	[IMX8MP] = {
>  		.variant = IMX8MP,
>  		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
>  		.gpr = "fsl,imx8mp-iomuxc-gpr",
> +		.clk_names = imx6_3clks_bus_pcie_aux,
> +		.clks_cnt = ARRAY_SIZE(imx6_3clks_bus_pcie_aux),
>  	},
>  	[IMX8MQ_EP] = {
>  		.variant = IMX8MQ_EP,
>  		.mode = DW_PCIE_EP_TYPE,
>  		.gpr = "fsl,imx8mq-iomuxc-gpr",
> +		.clk_names = imx6_4clks_bus_pcie_phy_aux,
> +		.clks_cnt = ARRAY_SIZE(imx6_4clks_bus_pcie_phy_aux),
>  	},
>  	[IMX8MM_EP] = {
>  		.variant = IMX8MM_EP,
>  		.mode = DW_PCIE_EP_TYPE,
>  		.gpr = "fsl,imx8mm-iomuxc-gpr",
> +		.clk_names = imx6_3clks_bus_pcie_aux,
> +		.clks_cnt = ARRAY_SIZE(imx6_3clks_bus_pcie_aux),
>  	},
>  	[IMX8MP_EP] = {
>  		.variant = IMX8MP_EP,
>  		.mode = DW_PCIE_EP_TYPE,
>  		.gpr = "fsl,imx8mp-iomuxc-gpr",
> +		.clk_names = imx6_3clks_bus_pcie_aux,
> +		.clks_cnt = ARRAY_SIZE(imx6_3clks_bus_pcie_aux),
>  	},
>  };
>  
> -- 
> 2.34.1
> 

-- 
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