netdev - Re: [PATCH 3/8] clk: qcom: gcc: Add PCIe, EMAC and UFS GDSCs for SM8150

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Date:   Mon, 31 Jan 2022 18:09:41 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, bhupesh.linux@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, agross@...nel.org, sboyd@...nel.org,
        tdas@...eaurora.org, mturquette@...libre.com,
        linux-clk@...r.kernel.org, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH 3/8] clk: qcom: gcc: Add PCIe, EMAC and UFS GDSCs for
 SM8150

On Wed 26 Jan 16:17 CST 2022, Bhupesh Sharma wrote:

> This adds the PCIe, EMAC and UFS GDSC structures for
> SM8150. The GDSC will allow the respective system to be
> brought out of reset.
> 
> Cc: Stephen Boyd <sboyd@...nel.org>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
>  drivers/clk/qcom/gcc-sm8150.c               | 74 +++++++++++++++++----
>  include/dt-bindings/clock/qcom,gcc-sm8150.h |  9 ++-
>  2 files changed, 69 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-sm8150.c b/drivers/clk/qcom/gcc-sm8150.c
> index 245794485719..ada755ad55f7 100644
> --- a/drivers/clk/qcom/gcc-sm8150.c
> +++ b/drivers/clk/qcom/gcc-sm8150.c
> @@ -3448,22 +3448,67 @@ static struct clk_branch gcc_video_xo_clk = {
>  	},
>  };
>  
> +static struct gdsc emac_gdsc = {
> +	.gdscr = 0x6004,
> +	.pd = {
> +		.name = "emac_gdsc",
> +	},
> +	.pwrsts = PWRSTS_OFF_ON,
> +	.flags = POLL_CFG_GDSCR,
> +};
> +
> +static struct gdsc pcie_0_gdsc = {
> +	.gdscr = 0x6b004,
> +	.pd = {
> +		.name = "pcie_0_gdsc",
> +	},
> +	.pwrsts = PWRSTS_OFF_ON,
> +	.flags = POLL_CFG_GDSCR,
> +};
> +
> +static struct gdsc pcie_1_gdsc = {
> +	.gdscr = 0x8d004,
> +	.pd = {
> +		.name = "pcie_1_gdsc",
> +	},
> +	.pwrsts = PWRSTS_OFF_ON,
> +	.flags = POLL_CFG_GDSCR,
> +};
> +
> +static struct gdsc ufs_card_gdsc = {
> +	.gdscr = 0x75004,
> +	.pd = {
> +		.name = "ufs_card_gdsc",
> +	},
> +	.pwrsts = PWRSTS_OFF_ON,
> +	.flags = POLL_CFG_GDSCR,
> +};
> +
> +static struct gdsc ufs_phy_gdsc = {
> +	.gdscr = 0x77004,
> +	.pd = {
> +		.name = "ufs_phy_gdsc",
> +	},
> +	.pwrsts = PWRSTS_OFF_ON,
> +	.flags = POLL_CFG_GDSCR,
> +};
> +
>  static struct gdsc usb30_prim_gdsc = {
> -		.gdscr = 0xf004,
> -		.pd = {
> -			.name = "usb30_prim_gdsc",
> -		},
> -		.pwrsts = PWRSTS_OFF_ON,
> -		.flags = POLL_CFG_GDSCR,
> +	.gdscr = 0xf004,
> +	.pd = {
> +		.name = "usb30_prim_gdsc",
> +	},
> +	.pwrsts = PWRSTS_OFF_ON,
> +	.flags = POLL_CFG_GDSCR,
>  };
>  
>  static struct gdsc usb30_sec_gdsc = {
> -		.gdscr = 0x10004,
> -		.pd = {
> -			.name = "usb30_sec_gdsc",
> -		},
> -		.pwrsts = PWRSTS_OFF_ON,
> -		.flags = POLL_CFG_GDSCR,
> +	.gdscr = 0x10004,
> +	.pd = {
> +		.name = "usb30_sec_gdsc",
> +	},
> +	.pwrsts = PWRSTS_OFF_ON,
> +	.flags = POLL_CFG_GDSCR,
>  };
>  
>  static struct clk_regmap *gcc_sm8150_clocks[] = {
> @@ -3714,6 +3759,11 @@ static const struct qcom_reset_map gcc_sm8150_resets[] = {
>  };
>  
>  static struct gdsc *gcc_sm8150_gdscs[] = {
> +	[EMAC_GDSC] = &emac_gdsc,
> +	[PCIE_0_GDSC] = &pcie_0_gdsc,
> +	[PCIE_1_GDSC] = &pcie_1_gdsc,
> +	[UFS_CARD_GDSC] = &ufs_card_gdsc,
> +	[UFS_PHY_GDSC] = &ufs_phy_gdsc,
>  	[USB30_PRIM_GDSC] = &usb30_prim_gdsc,
>  	[USB30_SEC_GDSC] = &usb30_sec_gdsc,
>  };
> diff --git a/include/dt-bindings/clock/qcom,gcc-sm8150.h b/include/dt-bindings/clock/qcom,gcc-sm8150.h
> index 3e1a91876610..35d80ae411a0 100644
> --- a/include/dt-bindings/clock/qcom,gcc-sm8150.h
> +++ b/include/dt-bindings/clock/qcom,gcc-sm8150.h
> @@ -241,7 +241,12 @@
>  #define GCC_USB_PHY_CFG_AHB2PHY_BCR				28
>  
>  /* GCC GDSCRs */
> -#define USB30_PRIM_GDSC                     4
> -#define USB30_SEC_GDSC						5

These constants goes into .dtb files as numbers (4 and 5), changing them
will cause annoying-to-debug bugs in the transition while people still
are testing a new kernel with last weeks dtb.

So please add the new constants without affecting these numbers.

Rest looks good.

Regards,
Bjorn

> +#define EMAC_GDSC						0
> +#define PCIE_0_GDSC						1
> +#define	PCIE_1_GDSC						2
> +#define UFS_CARD_GDSC						3
> +#define UFS_PHY_GDSC						4
> +#define USB30_PRIM_GDSC						5
> +#define USB30_SEC_GDSC						6
>  
>  #endif
> -- 
> 2.34.1
>