Messages in this thread |  | | Date | Mon, 11 Apr 2022 10:40:15 +0800 | Subject | Re: [PATCH v4 1/2] mtd: rawnand: meson: discard the common MMC sub clock framework | From | Liang Yang <> |
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Hi Miquel,
On 2022/4/4 16:30, Miquel Raynal wrote: > [ EXTERNAL EMAIL ] > > Hi Liang, > > liang.yang@amlogic.com wrote on Sat, 2 Apr 2022 15:49:19 +0800: > >> EMMC and NAND have the same clock control register named 'SD_EMMC_CLOCK' which is >> defined in EMMC port internally. bit0~5 of 'SD_EMMC_CLOCK' is the divider and >> bit6~7 is the mux for fix pll and xtal.A common MMC and NAND sub-clock has been >> implemented and can be used by the eMMC and NAND controller (which are mutually >> exclusive anyway). Let's use this new clock. >> >> Signed-off-by: Liang Yang <liang.yang@amlogic.com> >> --- >> drivers/mtd/nand/raw/meson_nand.c | 89 +++++++++++++++---------------- >> 1 file changed, 42 insertions(+), 47 deletions(-) >> >> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c >> index ac3be92872d0..1b1a9407fb2f 100644 >> --- a/drivers/mtd/nand/raw/meson_nand.c >> +++ b/drivers/mtd/nand/raw/meson_nand.c >> @@ -10,6 +10,7 @@ >> #include <linux/dma-mapping.h> >> #include <linux/interrupt.h> >> #include <linux/clk.h> >> +#include <linux/clk-provider.h> >> #include <linux/mtd/rawnand.h> >> #include <linux/mtd/mtd.h> >> #include <linux/mfd/syscon.h> >> @@ -19,6 +20,7 @@ >> #include <linux/iopoll.h> >> #include <linux/of.h> >> #include <linux/of_device.h> >> +#include <linux/of_address.h> >> #include <linux/sched/task_stack.h> >> >> #define NFC_REG_CMD 0x00 >> @@ -104,6 +106,9 @@ >> >> #define PER_INFO_BYTE 8 >> >> +#define CLK_DIV_SHIFT 0 >> +#define CLK_DIV_WIDTH 6 >> + >> struct meson_nfc_nand_chip { >> struct list_head node; >> struct nand_chip nand; >> @@ -151,15 +156,15 @@ struct meson_nfc { >> struct nand_controller controller; >> struct clk *core_clk; >> struct clk *device_clk; >> - struct clk *phase_tx; >> - struct clk *phase_rx; >> + struct clk *nand_clk; >> + struct clk_divider nand_divider; >> >> unsigned long clk_rate; >> u32 bus_timing; >> >> struct device *dev; >> void __iomem *reg_base; >> - struct regmap *reg_clk; >> + void __iomem *sd_emmc_clock; >> struct completion completion; >> struct list_head chips; >> const struct meson_nfc_data *data; >> @@ -235,7 +240,7 @@ static void meson_nfc_select_chip(struct nand_chip *nand, int chip) >> nfc->timing.tbers_max = meson_chip->tbers_max; >> >> if (nfc->clk_rate != meson_chip->clk_rate) { >> - ret = clk_set_rate(nfc->device_clk, meson_chip->clk_rate); >> + ret = clk_set_rate(nfc->nand_clk, meson_chip->clk_rate); >> if (ret) { >> dev_err(nfc->dev, "failed to set clock rate\n"); >> return; >> @@ -406,7 +411,6 @@ static int meson_nfc_queue_rb(struct meson_nfc *nfc, int timeout_ms) >> cmd = NFC_CMD_RB | NFC_CMD_RB_INT >> | nfc->param.chip_select | nfc->timing.tbers_max; >> writel(cmd, nfc->reg_base + NFC_REG_CMD); >> - > > Please avoid these spacing changes in the middle of a commit.
ok, i will fix it. > >> ret = wait_for_completion_timeout(&nfc->completion, >> msecs_to_jiffies(timeout_ms)); >> if (ret == 0) >> @@ -985,9 +989,11 @@ static const struct mtd_ooblayout_ops meson_ooblayout_ops = { >> .free = meson_ooblayout_free, >> }; >> >> +struct clk_parent_data nfc_divider_parent_data[1]; >> static int meson_nfc_clk_init(struct meson_nfc *nfc) >> { >> int ret; >> + struct clk_init_data init = {0}; >> >> /* request core clock */ >> nfc->core_clk = devm_clk_get(nfc->dev, "core"); >> @@ -1002,21 +1008,26 @@ static int meson_nfc_clk_init(struct meson_nfc *nfc) >> return PTR_ERR(nfc->device_clk); >> } >> >> - nfc->phase_tx = devm_clk_get(nfc->dev, "tx"); >> - if (IS_ERR(nfc->phase_tx)) { >> - dev_err(nfc->dev, "failed to get TX clk\n"); >> - return PTR_ERR(nfc->phase_tx); >> - } >> - >> - nfc->phase_rx = devm_clk_get(nfc->dev, "rx"); >> - if (IS_ERR(nfc->phase_rx)) { >> - dev_err(nfc->dev, "failed to get RX clk\n"); >> - return PTR_ERR(nfc->phase_rx); >> - } >> + init.name = devm_kstrdup(nfc->dev, "nfc#div", GFP_KERNEL); >> + init.ops = &clk_divider_ops; >> + nfc_divider_parent_data[0].fw_name = "device"; >> + init.parent_data = nfc_divider_parent_data; >> + init.num_parents = 1; >> + nfc->nand_divider.reg = nfc->sd_emmc_clock; >> + nfc->nand_divider.shift = CLK_DIV_SHIFT; >> + nfc->nand_divider.width = CLK_DIV_WIDTH; >> + nfc->nand_divider.hw.init = &init; >> + nfc->nand_divider.flags = CLK_DIVIDER_ONE_BASED | >> + CLK_DIVIDER_ROUND_CLOSEST | >> + CLK_DIVIDER_ALLOW_ZERO; >> + >> + nfc->nand_clk = devm_clk_register(nfc->dev, &nfc->nand_divider.hw); >> + if (IS_ERR(nfc->nand_clk)) >> + return PTR_ERR(nfc->nand_clk); >> >> /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */ >> - regmap_update_bits(nfc->reg_clk, >> - 0, CLK_SELECT_NAND, CLK_SELECT_NAND); >> + writel(CLK_SELECT_NAND | readl(nfc->sd_emmc_clock), >> + nfc->sd_emmc_clock); >> >> ret = clk_prepare_enable(nfc->core_clk); >> if (ret) { >> @@ -1030,29 +1041,21 @@ static int meson_nfc_clk_init(struct meson_nfc *nfc) >> goto err_device_clk; >> } >> >> - ret = clk_prepare_enable(nfc->phase_tx); >> + ret = clk_prepare_enable(nfc->nand_clk); >> if (ret) { >> - dev_err(nfc->dev, "failed to enable TX clock\n"); >> - goto err_phase_tx; >> + dev_err(nfc->dev, "pre enable NFC divider fail\n"); >> + goto err_nand_clk; >> } >> >> - ret = clk_prepare_enable(nfc->phase_rx); >> - if (ret) { >> - dev_err(nfc->dev, "failed to enable RX clock\n"); >> - goto err_phase_rx; >> - } >> - >> - ret = clk_set_rate(nfc->device_clk, 24000000); >> + ret = clk_set_rate(nfc->nand_clk, 24000000); > > Is this rename really useful?
yes, it works.
> >> if (ret) >> - goto err_disable_rx; >> + goto err_disable_clk; >> >> return 0; >> >> -err_disable_rx: >> - clk_disable_unprepare(nfc->phase_rx); >> -err_phase_rx: >> - clk_disable_unprepare(nfc->phase_tx); >> -err_phase_tx: >> +err_disable_clk: >> + clk_disable_unprepare(nfc->nand_clk); >> +err_nand_clk: >> clk_disable_unprepare(nfc->device_clk); >> err_device_clk: >> clk_disable_unprepare(nfc->core_clk); >> @@ -1061,8 +1064,7 @@ static int meson_nfc_clk_init(struct meson_nfc *nfc) >> >> static void meson_nfc_disable_clk(struct meson_nfc *nfc) >> { >> - clk_disable_unprepare(nfc->phase_rx); >> - clk_disable_unprepare(nfc->phase_tx); >> + clk_disable_unprepare(nfc->nand_clk); >> clk_disable_unprepare(nfc->device_clk); >> clk_disable_unprepare(nfc->core_clk); >> } >> @@ -1374,7 +1376,6 @@ static int meson_nfc_probe(struct platform_device *pdev) >> { >> struct device *dev = &pdev->dev; >> struct meson_nfc *nfc; >> - struct resource *res; >> int ret, irq; >> >> nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL); >> @@ -1388,21 +1389,15 @@ static int meson_nfc_probe(struct platform_device *pdev) >> nand_controller_init(&nfc->controller); >> INIT_LIST_HEAD(&nfc->chips); >> init_completion(&nfc->completion); >> - > > Please don't modify spacing in this commit. >ok
>> nfc->dev = dev; >> >> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); >> - nfc->reg_base = devm_ioremap_resource(dev, res); >> + nfc->reg_base = devm_platform_ioremap_resource_byname(pdev, "nfc"); > > This change seems unrelated.
To be consistent with the following devm_platform_ioremap_resource_byname(pdev, "emmc"). do you mean that we don't need it?> >> if (IS_ERR(nfc->reg_base)) >> return PTR_ERR(nfc->reg_base); >> >> - nfc->reg_clk = >> - syscon_regmap_lookup_by_phandle(dev->of_node, >> - "amlogic,mmc-syscon"); >> - if (IS_ERR(nfc->reg_clk)) { >> - dev_err(dev, "Failed to lookup clock base\n"); >> - return PTR_ERR(nfc->reg_clk); >> - } >> + nfc->sd_emmc_clock = devm_platform_ioremap_resource_byname(pdev, "emmc"); >> + if (IS_ERR(nfc->sd_emmc_clock)) >> + return PTR_ERR(nfc->sd_emmc_clock); > > While I agree this is much better than the previous solution, we cannot > break DT compatibility, so you need to try getting the emmc clock, but > if it fails you should fallback to the regmap lookup.
ok, i will fix it next version. thanks.
> >> >> irq = platform_get_irq(pdev, 0); >> if (irq < 0) > > > Thanks, > Miquèl > > .
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