linux-kernel - Re: [PATCH 4/5] clk: imx: imx8ulp: Add tpm5 clock as critical gate clock

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Date:   Sun, 9 Apr 2023 17:10:05 +0300
From:   Abel Vesa <abel.vesa@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     abelvesa@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jacky Bai <ping.bai@....com>, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 4/5] clk: imx: imx8ulp: Add tpm5 clock as critical gate
 clock

On 23-03-31 14:38:13, Peng Fan (OSS) wrote:
> From: Jacky Bai <ping.bai@....com>
> 
> The TPM5 is used for broadcast timer purpose and registered
> with TIMER_OF_DECLARE. As the clock driver is not ready at
> that stage, so the TPM5 clock is configured in bootloader(TF-A).
> if we just remove the TPM5 clock from linux will introduce a
> risk that the TPM5's parent clock will be gated, then lead to
> TPM's channel control config can NOT be written into register
> successfully.
> 
> Due to the above reason, we still need to add the TPM5 clock
> into linux clock but register it as a simple critical gate
> clock to make sure its parent is always on.
> 
> Reviewed-by: Peng Fan <peng.fan@....com>
> Signed-off-by: Jacky Bai <ping.bai@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>

Reviewed-by: Abel Vesa <abel.vesa@...aro.org>

> ---
>  drivers/clk/imx/clk-imx8ulp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/imx/clk-imx8ulp.c b/drivers/clk/imx/clk-imx8ulp.c
> index 0dd48e8159ee..6a8a9e50d826 100644
> --- a/drivers/clk/imx/clk-imx8ulp.c
> +++ b/drivers/clk/imx/clk-imx8ulp.c
> @@ -333,7 +333,6 @@ static int imx8ulp_clk_pcc3_init(struct platform_device *pdev)
>  	clks[IMX8ULP_CLK_WDOG4] = imx8ulp_clk_hw_composite("wdog4", pcc3_periph_bus_sels, ARRAY_SIZE(pcc3_periph_bus_sels), true, true, true, base + 0xac, 1);
>  	clks[IMX8ULP_CLK_LPIT1] = imx8ulp_clk_hw_composite("lpit1", pcc3_periph_bus_sels, ARRAY_SIZE(pcc3_periph_bus_sels), true, true, true, base + 0xc8, 1);
>  	clks[IMX8ULP_CLK_TPM4] = imx8ulp_clk_hw_composite("tpm4", pcc3_periph_bus_sels, ARRAY_SIZE(pcc3_periph_bus_sels), true, true, true, base + 0xcc, 1);
> -	clks[IMX8ULP_CLK_TPM5] = imx8ulp_clk_hw_composite("tpm5", pcc3_periph_bus_sels, ARRAY_SIZE(pcc3_periph_bus_sels), true, true, true, base + 0xd0, 1);
>  	clks[IMX8ULP_CLK_FLEXIO1] = imx8ulp_clk_hw_composite("flexio1", pcc3_periph_bus_sels, ARRAY_SIZE(pcc3_periph_bus_sels), true, true, true, base + 0xd4, 1);
>  	clks[IMX8ULP_CLK_I3C2] = imx8ulp_clk_hw_composite("i3c2", pcc3_periph_bus_sels, ARRAY_SIZE(pcc3_periph_bus_sels), true, true, true, base + 0xd8, 1);
>  	clks[IMX8ULP_CLK_LPI2C4] = imx8ulp_clk_hw_composite("lpi2c4", pcc3_periph_bus_sels, ARRAY_SIZE(pcc3_periph_bus_sels), true, true, true, base + 0xdc, 1);
> @@ -378,6 +377,7 @@ static int imx8ulp_clk_pcc3_init(struct platform_device *pdev)
>  	clks[IMX8ULP_CLK_DMA1_CH31] = imx_clk_hw_gate("pcc_dma1_ch31", "xbar_ad_divplat", base + 0x84, 30);
>  	clks[IMX8ULP_CLK_MU0_B] = imx_clk_hw_gate_flags("mu0_b", "xbar_ad_divplat", base + 0x88, 30, CLK_IS_CRITICAL);
>  	clks[IMX8ULP_CLK_MU3_A] = imx_clk_hw_gate("mu3_a", "xbar_ad_divplat", base + 0x8c, 30);
> +	clks[IMX8ULP_CLK_TPM5] = imx_clk_hw_gate_flags("tpm5", "sosc_div2",  base + 0xd0, 30, CLK_IS_CRITICAL);
>  
>  	imx_check_clk_hws(clks, clk_data->num);
>  
> -- 
> 2.37.1
>