Re: [PATCH v7 5/7] clk: imx: Add initial support for i.MXRT1050 clock driver

From: Jesse Taube <mr.bossman075@gmail.com>
To: Stephen Boyd <sboyd@kernel.org>, linux-imx@nxp.com
Cc: mturquette@baylibre.com, robh+dt@kernel.org, shawnguo@kernel.org,
	s.hauer@pengutronix.de, kernel@pengutronix.de,
	festevam@gmail.com, ulf.hansson@linaro.org, aisheng.dong@nxp.com,
	stefan@agner.ch, linus.walleij@linaro.org,
	gregkh@linuxfoundation.org, arnd@arndb.de, olof@lixom.net,
	soc@kernel.org, linux@armlinux.org.uk, abel.vesa@nxp.com,
	adrian.hunter@intel.com, jirislaby@kernel.org,
	giulio.benetti@benettiengineering.com,
	nobuhiro1.iwamatsu@toshiba.co.jp, linux-clk@vger.kernel.org,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org,
	linux-gpio@vger.kernel.org, linux-serial@vger.kernel.org
Subject: Re: [PATCH v7 5/7] clk: imx: Add initial support for i.MXRT1050 clock driver
Date: Sun, 9 Jan 2022 14:07:42 -0500	[thread overview]
Message-ID: <89046151-e44e-6828-ad76-8574fba4fca8@gmail.com> (raw)
In-Reply-To: <20220105235157.8ED80C36AEB@smtp.kernel.org>

>> +static const char * const pll_ref_sels[] = {"osc", "dummy", };
>> +static const char * const per_sels[] = {"ipg_pdof", "osc", };
>> +static const char * const pll1_bypass_sels[] = {"pll1_arm", "pll1_arm_ref_sel", };
>> +static const char * const pll2_bypass_sels[] = {"pll2_sys", "pll2_sys_ref_sel", };
>> +static const char * const pll3_bypass_sels[] = {"pll3_usb_otg", "pll3_usb_otg_ref_sel", };
>> +static const char * const pll5_bypass_sels[] = {"pll5_video", "pll5_video_ref_sel", };
>> +static const char *const pre_periph_sels[] = {
>> +       "pll2_sys", "pll2_pfd2_396m", "pll2_pfd0_352m", "arm_podf", };
>> +static const char *const periph_sels[] = { "pre_periph_sel", "todo", };
>> +static const char *const usdhc_sels[] = { "pll2_pfd2_396m", "pll2_pfd0_352m", };
>> +static const char *const lpuart_sels[] = { "pll3_80m", "osc", };
>> +static const char *const lcdif_sels[] = {
>> +       "pll2_sys", "pll3_pfd3_454_74m", "pll5_video", "pll2_pfd0_352m",
>> +       "pll2_pfd1_594m", "pll3_pfd1_664_62m", };
>> +static const char *const semc_alt_sels[] = { "pll2_pfd2_396m", "pll3_pfd1_664_62m", };
>> +static const char *const semc_sels[] = { "periph_sel", "semc_alt_sel", };
> 
> Any chance this can use clk_parent_data instead of string names for
> parents?
> 
>> +
>> +static struct clk_hw **hws;
>> +static struct clk_hw_onecell_data *clk_hw_data;
>> +
>> +static void __init imxrt_clocks_common_init(void __iomem *base)
> 
> Drop __init and preferably inline this to the callsite.
> 
>> +{
>> +       /* Anatop clocks */
>> +       hws[IMXRT1050_CLK_DUMMY] = imx_clk_hw_fixed("dummy", 0UL);
>> +
>> +       hws[IMXRT1050_CLK_PLL1_REF_SEL] = imx_clk_hw_mux("pll1_arm_ref_sel",
>> +               base + 0x0, 14, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
>> +       hws[IMXRT1050_CLK_PLL2_REF_SEL] = imx_clk_hw_mux("pll2_sys_ref_sel",
>> +               base + 0x30, 14, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
>> +       hws[IMXRT1050_CLK_PLL3_REF_SEL] = imx_clk_hw_mux("pll3_usb_otg_ref_sel",
>> +               base + 0x10, 14, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
>> +       hws[IMXRT1050_CLK_PLL5_REF_SEL] = imx_clk_hw_mux("pll5_video_ref_sel",
>> +               base + 0xa0, 14, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
>> +
>> +       hws[IMXRT1050_CLK_PLL1_ARM] = imx_clk_hw_pllv3(IMX_PLLV3_SYS, "pll1_arm",
>> +               "pll1_arm_ref_sel", base + 0x0, 0x7f);
>> +       hws[IMXRT1050_CLK_PLL2_SYS] = imx_clk_hw_pllv3(IMX_PLLV3_GENERIC, "pll2_sys",
>> +               "pll2_sys_ref_sel", base + 0x30, 0x1);
>> +       hws[IMXRT1050_CLK_PLL3_USB_OTG] = imx_clk_hw_pllv3(IMX_PLLV3_USB, "pll3_usb_otg",
>> +               "pll3_usb_otg_ref_sel", base + 0x10, 0x1);
>> +       hws[IMXRT1050_CLK_PLL5_VIDEO] = imx_clk_hw_pllv3(IMX_PLLV3_AV, "pll5_video",
>> +               "pll5_video_ref_sel", base + 0xa0, 0x7f);
>> +
>> +       /* PLL bypass out */
>> +       hws[IMXRT1050_CLK_PLL1_BYPASS] = imx_clk_hw_mux_flags("pll1_bypass", base + 0x0, 16, 1,
>> +               pll1_bypass_sels, ARRAY_SIZE(pll1_bypass_sels), CLK_SET_RATE_PARENT);
>> +       hws[IMXRT1050_CLK_PLL2_BYPASS] = imx_clk_hw_mux_flags("pll2_bypass", base + 0x30, 16, 1,
>> +               pll2_bypass_sels, ARRAY_SIZE(pll2_bypass_sels), CLK_SET_RATE_PARENT);
>> +       hws[IMXRT1050_CLK_PLL3_BYPASS] = imx_clk_hw_mux_flags("pll3_bypass", base + 0x10, 16, 1,
>> +               pll3_bypass_sels, ARRAY_SIZE(pll3_bypass_sels), CLK_SET_RATE_PARENT);
>> +       hws[IMXRT1050_CLK_PLL5_BYPASS] = imx_clk_hw_mux_flags("pll5_bypass", base + 0xa0, 16, 1,
>> +               pll5_bypass_sels, ARRAY_SIZE(pll5_bypass_sels), CLK_SET_RATE_PARENT);
>> +
>> +       hws[IMXRT1050_CLK_VIDEO_POST_DIV_SEL] = imx_clk_hw_divider("video_post_div_sel",
>> +               "pll5_video", base + 0xa0, 19, 2);
>> +       hws[IMXRT1050_CLK_VIDEO_DIV] = imx_clk_hw_divider("video_div",
>> +               "video_post_div_sel", base + 0x170, 30, 2);
>> +
>> +       hws[IMXRT1050_CLK_PLL3_80M] = imx_clk_hw_fixed_factor("pll3_80m",  "pll3_usb_otg", 1, 6);
>> +
>> +       hws[IMXRT1050_CLK_PLL2_PFD0_352M] = imx_clk_hw_pfd("pll2_pfd0_352m", "pll2_sys", base + 0x100, 0);
>> +       hws[IMXRT1050_CLK_PLL2_PFD1_594M] = imx_clk_hw_pfd("pll2_pfd1_594m", "pll2_sys", base + 0x100, 1);
>> +       hws[IMXRT1050_CLK_PLL2_PFD2_396M] = imx_clk_hw_pfd("pll2_pfd2_396m", "pll2_sys", base + 0x100, 2);
>> +       hws[IMXRT1050_CLK_PLL3_PFD1_664_62M] = imx_clk_hw_pfd("pll3_pfd1_664_62m", "pll3_usb_otg", base + 0xf0, 1);
>> +       hws[IMXRT1050_CLK_PLL3_PFD3_454_74M] = imx_clk_hw_pfd("pll3_pfd3_454_74m", "pll3_usb_otg", base + 0xf0, 3);
>> +}
>> +
>> +static int imxrt1050_clocks_probe(struct platform_device *pdev)
>> +{
>> +       void __iomem *ccm_base;
>> +       void __iomem *pll_base;
>> +       struct device *dev = &pdev->dev;
>> +       struct device_node *np = dev->of_node;
>> +       struct device_node *anp;
>> +       int ret;
>> +
>> +       clk_hw_data = kzalloc(struct_size(clk_hw_data, hws,
>> +                                         IMXRT1050_CLK_END), GFP_KERNEL);
>> +       if (WARN_ON(!clk_hw_data))
>> +               return -ENOMEM;
>> +
>> +       clk_hw_data->num = IMXRT1050_CLK_END;
>> +       hws = clk_hw_data->hws;
>> +
>> +       hws[IMXRT1050_CLK_OSC] = __clk_get_hw(of_clk_get_by_name(np, "osc"));
> 
> Use clk_parent_data instead and reference the binding name with .fw_name

Hi Stephen, sorry to bother you again.
I'm wondering if adding `clk_parent_data` is necessary as it seems like 
it wold be a big change and the other IMX boards haven't implemented 
this yet would it be okay if I don't do this, or if it is necessary 
could you link to a patch set to change it.