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Date: Fri, 5 Apr 2024 09:55:49 +0200
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Subject: Re: [PATCH 08/17] clk: samsung: gs101: add support for cmu_hsi2
To: Peter Griffin <peter.griffin@linaro.org>, mturquette@baylibre.com,
 sboyd@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org,
 vkoul@kernel.org, kishon@kernel.org, alim.akhtar@samsung.com,
 avri.altman@wdc.com, bvanassche@acm.org, s.nawrocki@samsung.com,
 cw00.choi@samsung.com, jejb@linux.ibm.com, martin.petersen@oracle.com,
 chanho61.park@samsung.com, ebiggers@kernel.org
Cc: linux-scsi@vger.kernel.org, linux-phy@lists.infradead.org,
 devicetree@vger.kernel.org, linux-clk@vger.kernel.org,
 linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org, tudor.ambarus@linaro.org,
 andre.draszik@linaro.org, saravanak@google.com, willmcvicker@google.com
References: <20240404122559.898930-1-peter.griffin@linaro.org>
 <20240404122559.898930-9-peter.griffin@linaro.org>
Content-Language: en-US
From: Krzysztof Kozlowski <krzk@kernel.org>
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In-Reply-To: <20240404122559.898930-9-peter.griffin@linaro.org>
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On 04/04/2024 14:25, Peter Griffin wrote:
> CMU_HSI2 is the clock management unit used for the hsi2 block.
> HSI stands for High Speed Interface and as such it generates
> clocks for PCIe, UFS and MMC card.
> 
> This patch adds support for the muxes, dividers, and gates in
> cmu_hsi2.
> 
> CLK_GOUT_HSI2_HSI2_CMU_HSI2_PCLK is marked as CLK_IS_CRITICAL
> as disabling it leads to an immediate system hang.
> 
> CLK_GOUT_HSI2_SYSREG_HSI2_PCLK is also marked CLK_IS_CRITICAL.
> A hang is not observed with fine grained clock control, but
> UFS IP does not function with syscon controlling this clock
> just around hsi2_sysreg register accesses.
> 
> CLK_GOUT_HSI2_GPIO_HSI2_PCLK is marked CLK_IGNORE_UNUSED until
> the exynos pinctrl clock patches land then it can be removed.
> 
> Some clocks in this unit have very long names. To help with this
> the clock name mangling strategy was updated to include removing
> the following sub-strings.
> - G4X2_DWC_PCIE_CTL_
> - G4X1_DWC_PCIE_CTL_
> - PCIE_SUB_CTRL_
> - INST_0_
> - LN05LPE_
> - TM_WRAPPER_
> - SF_
> 
> Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
> 
> ---
> Updated regex for clock name mangling
>     sed \
>         -e 's|^PLL_LOCKTIME_PLL_\([^_]\+\)|fout_\L\1_pll|' \
>         \
>         -e 's|^PLL_CON0_MUX_CLKCMU_\([^_]\+\)_\(.*\)|mout_\L\1_\2|' \
>         -e 's|^PLL_CON0_PLL_\(.*\)|mout_pll_\L\1|' \
>         -e 's|^CLK_CON_MUX_MUX_CLK_\(.*\)|mout_\L\1|' \
>         -e '/^PLL_CON[1-4]_[^_]\+_/d' \
>         -e '/^[^_]\+_CMU_[^_]\+_CONTROLLER_OPTION/d' \
>         -e '/^CLKOUT_CON_BLK_[^_]\+_CMU_[^_]\+_CLKOUT0/d' \
>         \
>         -e 's|_IPCLKPORT||' \
>         -e 's|_RSTNSYNC||' \
>         -e 's|_G4X2_DWC_PCIE_CTL||' \
>         -e 's|_G4X1_DWC_PCIE_CTL||' \
>         -e 's|_PCIE_SUB_CTRL||' \
>         -e 's|_INST_0||g' \
>         -e 's|_LN05LPE||' \
>         -e 's|_TM_WRAPPER||' \
>         -e 's|_SF||' \
>         \
>         -e 's|^CLK_CON_DIV_DIV_CLK_\([^_]\+\)_\(.*\)|dout_\L\1_\2|' \
>         \
>         -e 's|^CLK_CON_BUF_CLKBUF_\([^_]\+\)_\(.*\)|gout_\L\1_\2|' \
>         -e 's|^CLK_CON_GAT_CLK_BLK_\([^_]\+\)_UID_\(.*\)|gout_\L\1_\2|' \
>         -e 's|^gout_[^_]\+_[^_]\+_cmu_\([^_]\+\)_pclk$|gout_\1_\1_pclk|' \
>         -e 's|^CLK_CON_GAT_GOUT_BLK_\([^_]\+\)_UID_\(.*\)|gout_\L\1_\2|' \
>         -e 's|^CLK_CON_GAT_CLK_\([^_]\+\)_\(.*\)|gout_\L\1_clk_\L\1_\2|' \
>         \
>         -e '/^\(DMYQCH\|PCH\|QCH\|QUEUE\)_/d'
> ---
>  drivers/clk/samsung/clk-gs101.c          | 558 +++++++++++++++++++++++
>  include/dt-bindings/clock/google,gs101.h |  63 +++

Bindings are separate patches.

>  2 files changed, 621 insertions(+)
> 
> diff --git a/drivers/clk/samsung/clk-gs101.c b/drivers/clk/samsung/clk-gs101.c
> index d065e343a85d..b9f84c7d5c22 100644
> --- a/drivers/clk/samsung/clk-gs101.c
> +++ b/drivers/clk/samsung/clk-gs101.c
> @@ -22,6 +22,7 @@
>  #define CLKS_NR_MISC	(CLK_GOUT_MISC_XIU_D_MISC_ACLK + 1)
>  #define CLKS_NR_PERIC0	(CLK_GOUT_PERIC0_SYSREG_PERIC0_PCLK + 1)
>  #define CLKS_NR_PERIC1	(CLK_GOUT_PERIC1_SYSREG_PERIC1_PCLK + 1)
> +#define CLKS_NR_HSI2	(CLK_GOUT_HSI2_XIU_P_HSI2_ACLK + 1)
>  
>  /* ---- CMU_TOP ------------------------------------------------------------- */
>  
> @@ -3409,6 +3410,560 @@ static const struct samsung_cmu_info peric1_cmu_info __initconst = {
>  	.clk_name		= "bus",
>  };
>  
> +/* ---- CMU_HSI2 ---------------------------------------------------------- */
> +
> +/* Register Offset definitions for CMU_HSI2 (0x14400000) */
> +#define PLL_CON0_MUX_CLKCMU_HSI2_BUS_USER												0x0600
> +#define PLL_CON1_MUX_CLKCMU_HSI2_BUS_USER												0x0604
> +#define PLL_CON0_MUX_CLKCMU_HSI2_MMC_CARD_USER												0x0610
> +#define PLL_CON1_MUX_CLKCMU_HSI2_MMC_CARD_USER												0x0614
> +#define PLL_CON0_MUX_CLKCMU_HSI2_PCIE_USER												0x0620
> +#define PLL_CON1_MUX_CLKCMU_HSI2_PCIE_USER												0x0624
> +#define PLL_CON0_MUX_CLKCMU_HSI2_UFS_EMBD_USER												0x0630
> +#define PLL_CON1_MUX_CLKCMU_HSI2_UFS_EMBD_USER												0x0634
> +#define HSI2_CMU_HSI2_CONTROLLER_OPTION													0x0800
> +#define CLKOUT_CON_BLK_HSI2_CMU_HSI2_CLKOUT0												0x0810
> +#define CLK_CON_GAT_CLK_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_003_PCIE_SUB_CTRL_INST_0_PHY_REFCLK_IN					0x2000
> +#define CLK_CON_GAT_CLK_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_004_PCIE_SUB_CTRL_INST_0_PHY_REFCLK_IN					0x2004
> +#define CLK_CON_GAT_CLK_BLK_HSI2_UID_SSMT_PCIE_IA_GEN4A_1_IPCLKPORT_ACLK								0x2008
> +#define CLK_CON_GAT_CLK_BLK_HSI2_UID_SSMT_PCIE_IA_GEN4A_1_IPCLKPORT_PCLK								0x200c
> +#define CLK_CON_GAT_CLK_BLK_HSI2_UID_SSMT_PCIE_IA_GEN4B_1_IPCLKPORT_ACLK								0x2010
> +#define CLK_CON_GAT_CLK_BLK_HSI2_UID_SSMT_PCIE_IA_GEN4B_1_IPCLKPORT_PCLK								0x2014
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_D_TZPC_HSI2_IPCLKPORT_PCLK									0x201c
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_GPC_HSI2_IPCLKPORT_PCLK										0x2020
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_GPIO_HSI2_IPCLKPORT_PCLK										0x2024
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_HSI2_CMU_HSI2_IPCLKPORT_PCLK									0x2028
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_LHM_AXI_P_HSI2_IPCLKPORT_I_CLK									0x202c
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_LHS_ACEL_D_HSI2_IPCLKPORT_I_CLK									0x2030
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_MMC_CARD_IPCLKPORT_I_ACLK										0x2034
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_MMC_CARD_IPCLKPORT_SDCLKIN									0x2038
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_003_G4X2_DWC_PCIE_CTL_INST_0_DBI_ACLK_UG				0x203c
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_003_G4X2_DWC_PCIE_CTL_INST_0_MSTR_ACLK_UG				0x2040
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_003_G4X2_DWC_PCIE_CTL_INST_0_SLV_ACLK_UG				0x2044
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_003_PCIE_SUB_CTRL_INST_0_I_DRIVER_APB_CLK				0x2048
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_004_G4X1_DWC_PCIE_CTL_INST_0_DBI_ACLK_UG				0x204c
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_004_G4X1_DWC_PCIE_CTL_INST_0_MSTR_ACLK_UG				0x2050
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_004_G4X1_DWC_PCIE_CTL_INST_0_SLV_ACLK_UG				0x2054
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCIE_004_PCIE_SUB_CTRL_INST_0_I_DRIVER_APB_CLK				0x2058
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCS_PMA_INST_0_PHY_UDBG_I_APB_PCLK						0x205c
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCS_PMA_INST_0_PIPE_PAL_PCIE_INST_0_I_APB_PCLK				0x2060
> +#define CLK_CON_GAT_GOUT_BLK_HSI2_UID_PCIE_GEN4_1_IPCLKPORT_PCS_PMA_INST_0_SF_PCIEPHY210X2_LN05LPE_QCH_TM_WRAPPER_INST_0_I_APB_PCLK	0x2064

Is it doable to use shorter register names while still keeping them
close to datasheet/manual? This one is a bit too much... actually most
of them are quite too much. :)


..

> +
>  /* ---- platform_driver ----------------------------------------------------- */
>  
>  static int __init gs101_cmu_probe(struct platform_device *pdev)
> @@ -3432,6 +3987,9 @@ static const struct of_device_id gs101_cmu_of_match[] = {
>  	}, {
>  		.compatible = "google,gs101-cmu-peric1",
>  		.data = &peric1_cmu_info,
> +	}, {
> +		.compatible = "google,gs101-cmu-hsi2",
> +		.data = &hsi2_cmu_info,

Keep these also alphabetically ordered by compatible.


Best regards,
Krzysztof