Re: [PATCH v2] clk: at91: add sama5d3 pmc driver

From: Ahmad Fatoum
Date: Mon Jun 22 2020 - 17:24:57 EST

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Hello Alexandre,

On 1/10/20 11:30 PM, Alexandre Belloni wrote:
> Add a driver for the PMC clocks of the sama5d3.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
> ---
> Changes in v2:
> - fixed the output range for the paripheral clocks
> - added a comment why the PMC driver can't be a platform driver
>
> drivers/clk/at91/Makefile | 1 +
> drivers/clk/at91/sama5d3.c | 240 +++++++++++++++++++++++++++++++++++++
> 2 files changed, 241 insertions(+)
> create mode 100644 drivers/clk/at91/sama5d3.c
>
> diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
> index 3732241352ce..e3be7f40f79e 100644
> --- a/drivers/clk/at91/Makefile
> +++ b/drivers/clk/at91/Makefile
> @@ -17,5 +17,6 @@ obj-$(CONFIG_HAVE_AT91_I2S_MUX_CLK) += clk-i2s-mux.o
> obj-$(CONFIG_HAVE_AT91_SAM9X60_PLL) += clk-sam9x60-pll.o
> obj-$(CONFIG_SOC_AT91SAM9) += at91sam9260.o at91sam9rl.o at91sam9x5.o
> obj-$(CONFIG_SOC_SAM9X60) += sam9x60.o
> +obj-$(CONFIG_SOC_SAMA5D3) += sama5d3.o
> obj-$(CONFIG_SOC_SAMA5D4) += sama5d4.o
> obj-$(CONFIG_SOC_SAMA5D2) += sama5d2.o
> diff --git a/drivers/clk/at91/sama5d3.c b/drivers/clk/at91/sama5d3.c
> new file mode 100644
> index 000000000000..88506f909c08
> --- /dev/null
> +++ b/drivers/clk/at91/sama5d3.c
> @@ -0,0 +1,240 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <linux/clk-provider.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/slab.h>
> +
> +#include <dt-bindings/clock/at91.h>
> +
> +#include "pmc.h"
> +
> +static const struct clk_master_characteristics mck_characteristics = {
> + .output = { .min = 0, .max = 166000000 },
> + .divisors = { 1, 2, 4, 3 },
> +};
> +
> +static u8 plla_out[] = { 0 };
> +
> +static u16 plla_icpll[] = { 0 };
> +
> +static const struct clk_range plla_outputs[] = {
> + { .min = 400000000, .max = 1000000000 },
> +};
> +
> +static const struct clk_pll_characteristics plla_characteristics = {
> + .input = { .min = 8000000, .max = 50000000 },
> + .num_output = ARRAY_SIZE(plla_outputs),
> + .output = plla_outputs,
> + .icpll = plla_icpll,
> + .out = plla_out,
> +};
> +
> +static const struct clk_pcr_layout sama5d3_pcr_layout = {
> + .offset = 0x10c,
> + .cmd = BIT(12),
> + .pid_mask = GENMASK(6, 0),
> + .div_mask = GENMASK(17, 16),
> +};
> +
> +static const struct {
> + char *n;
> + char *p;
> + u8 id;
> +} sama5d3_systemck[] = {
> + { .n = "ddrck", .p = "masterck", .id = 2 },
> + { .n = "lcdck", .p = "masterck", .id = 3 },
> + { .n = "smdck", .p = "smdclk", .id = 4 },
> + { .n = "uhpck", .p = "usbck", .id = 6 },
> + { .n = "udpck", .p = "usbck", .id = 7 },
> + { .n = "pck0", .p = "prog0", .id = 8 },
> + { .n = "pck1", .p = "prog1", .id = 9 },
> + { .n = "pck2", .p = "prog2", .id = 10 },
> +};
> +
> +static const struct {
> + char *n;
> + u8 id;
> + struct clk_range r;
> +} sama5d3_periphck[] = {
> + { .n = "dbgu_clk", .id = 2, },
> + { .n = "hsmc_clk", .id = 5, },
> + { .n = "pioA_clk", .id = 6, },
> + { .n = "pioB_clk", .id = 7, },
> + { .n = "pioC_clk", .id = 8, },
> + { .n = "pioD_clk", .id = 9, },
> + { .n = "pioE_clk", .id = 10, },
> + { .n = "usart0_clk", .id = 12, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "usart1_clk", .id = 13, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "usart2_clk", .id = 14, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "usart3_clk", .id = 15, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "uart0_clk", .id = 16, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "uart1_clk", .id = 17, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "twi0_clk", .id = 18, .r = { .min = 0, .max = 41500000 }, },
> + { .n = "twi1_clk", .id = 19, .r = { .min = 0, .max = 41500000 }, },
> + { .n = "twi2_clk", .id = 20, .r = { .min = 0, .max = 41500000 }, },
> + { .n = "mci0_clk", .id = 21, },
> + { .n = "mci1_clk", .id = 22, },
> + { .n = "mci2_clk", .id = 23, },
> + { .n = "spi0_clk", .id = 24, .r = { .min = 0, .max = 166000000 }, },
> + { .n = "spi1_clk", .id = 25, .r = { .min = 0, .max = 166000000 }, },
> + { .n = "tcb0_clk", .id = 26, .r = { .min = 0, .max = 166000000 }, },
> + { .n = "tcb1_clk", .id = 27, .r = { .min = 0, .max = 166000000 }, },
> + { .n = "pwm_clk", .id = 28, },
> + { .n = "adc_clk", .id = 29, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "dma0_clk", .id = 30, },
> + { .n = "dma1_clk", .id = 31, },
> + { .n = "uhphs_clk", .id = 32, },
> + { .n = "udphs_clk", .id = 33, },
> + { .n = "macb0_clk", .id = 34, },
> + { .n = "macb1_clk", .id = 35, },
> + { .n = "lcdc_clk", .id = 36, },
> + { .n = "isi_clk", .id = 37, },
> + { .n = "ssc0_clk", .id = 38, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "ssc1_clk", .id = 39, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "can0_clk", .id = 40, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "can1_clk", .id = 41, .r = { .min = 0, .max = 83000000 }, },
> + { .n = "sha_clk", .id = 42, },
> + { .n = "aes_clk", .id = 43, },
> + { .n = "tdes_clk", .id = 44, },
> + { .n = "trng_clk", .id = 45, },
> + { .n = "fuse_clk", .id = 48, },
> + { .n = "mpddr_clk", .id = 49, },
> +};
> +
> +static void __init sama5d3_pmc_setup(struct device_node *np)
> +{
> + const char *slck_name, *mainxtal_name;
> + struct pmc_data *sama5d3_pmc;
> + const char *parent_names[5];
> + struct regmap *regmap;
> + struct clk_hw *hw;
> + int i;
> + bool bypass;
> +
> + i = of_property_match_string(np, "clock-names", "slow_clk");
> + if (i < 0)
> + return;
> +
> + slck_name = of_clk_get_parent_name(np, i);
> +
> + i = of_property_match_string(np, "clock-names", "main_xtal");
> + if (i < 0)
> + return;
> + mainxtal_name = of_clk_get_parent_name(np, i);
> +
> + regmap = syscon_node_to_regmap(np);

Shouldn't this be device_node_to_regmap for the same reasons outlined in your
6956eb33 ("clk: at91: fix possible deadlock") commit?

Same question for at91sam9g45.c, sam9x60.c and at91sam9n12.c.

Thanks,
Ahmad

> + if (IS_ERR(regmap))
> + return;
> +
> + sama5d3_pmc = pmc_data_allocate(PMC_MAIN + 1,
> + nck(sama5d3_systemck),
> + nck(sama5d3_periphck), 0);
> + if (!sama5d3_pmc)
> + return;
> +
> + hw = at91_clk_register_main_rc_osc(regmap, "main_rc_osc", 12000000,
> + 50000000);
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + bypass = of_property_read_bool(np, "atmel,osc-bypass");
> +
> + hw = at91_clk_register_main_osc(regmap, "main_osc", mainxtal_name,
> + bypass);
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + parent_names[0] = "main_rc_osc";
> + parent_names[1] = "main_osc";
> + hw = at91_clk_register_sam9x5_main(regmap, "mainck", parent_names, 2);
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + hw = at91_clk_register_pll(regmap, "pllack", "mainck", 0,
> + &sama5d3_pll_layout, &plla_characteristics);
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + hw = at91_clk_register_plldiv(regmap, "plladivck", "pllack");
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + hw = at91_clk_register_utmi(regmap, NULL, "utmick", "mainck");
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + sama5d3_pmc->chws[PMC_UTMI] = hw;
> +
> + parent_names[0] = slck_name;
> + parent_names[1] = "mainck";
> + parent_names[2] = "plladivck";
> + parent_names[3] = "utmick";
> + hw = at91_clk_register_master(regmap, "masterck", 4, parent_names,
> + &at91sam9x5_master_layout,
> + &mck_characteristics);
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + sama5d3_pmc->chws[PMC_MCK] = hw;
> +
> + parent_names[0] = "plladivck";
> + parent_names[1] = "utmick";
> + hw = at91sam9x5_clk_register_usb(regmap, "usbck", parent_names, 2);
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + hw = at91sam9x5_clk_register_smd(regmap, "smdclk", parent_names, 2);
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + parent_names[0] = slck_name;
> + parent_names[1] = "mainck";
> + parent_names[2] = "plladivck";
> + parent_names[3] = "utmick";
> + parent_names[4] = "masterck";
> + for (i = 0; i < 3; i++) {
> + char name[6];
> +
> + snprintf(name, sizeof(name), "prog%d", i);
> +
> + hw = at91_clk_register_programmable(regmap, name,
> + parent_names, 5, i,
> + &at91sam9x5_programmable_layout);
> + if (IS_ERR(hw))
> + goto err_free;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(sama5d3_systemck); i++) {
> + hw = at91_clk_register_system(regmap, sama5d3_systemck[i].n,
> + sama5d3_systemck[i].p,
> + sama5d3_systemck[i].id);
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + sama5d3_pmc->shws[sama5d3_systemck[i].id] = hw;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(sama5d3_periphck); i++) {
> + hw = at91_clk_register_sam9x5_peripheral(regmap, &pmc_pcr_lock,
> + &sama5d3_pcr_layout,
> + sama5d3_periphck[i].n,
> + "masterck",
> + sama5d3_periphck[i].id,
> + &sama5d3_periphck[i].r);
> + if (IS_ERR(hw))
> + goto err_free;
> +
> + sama5d3_pmc->phws[sama5d3_periphck[i].id] = hw;
> + }
> +
> + of_clk_add_hw_provider(np, of_clk_hw_pmc_get, sama5d3_pmc);
> +
> + return;
> +
> +err_free:
> + pmc_data_free(sama5d3_pmc);
> +}
> +/*
> + * The TCB is used as the clocksource so its clock is needed early. This means
> + * this can't be a platform driver.
> + */
> +CLK_OF_DECLARE_DRIVER(sama5d3_pmc, "atmel,sama5d3-pmc", sama5d3_pmc_setup);
>

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