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Subject[PATCH] clk: at91: add at91rm9200 pmc driver
Date
Add a driver for the PMC clocks of the at91rm9200.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/clk/at91/Makefile | 1 +
drivers/clk/at91/at91rm9200.c | 199 ++++++++++++++++++++++++++++++++++
2 files changed, 200 insertions(+)
create mode 100644 drivers/clk/at91/at91rm9200.c

diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
index 3732241352ce..08fa7930c8fd 100644
--- a/drivers/clk/at91/Makefile
+++ b/drivers/clk/at91/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_HAVE_AT91_H32MX) += clk-h32mx.o
obj-$(CONFIG_HAVE_AT91_GENERATED_CLK) += clk-generated.o
obj-$(CONFIG_HAVE_AT91_I2S_MUX_CLK) += clk-i2s-mux.o
obj-$(CONFIG_HAVE_AT91_SAM9X60_PLL) += clk-sam9x60-pll.o
+obj-$(CONFIG_SOC_AT91RM9200) += at91rm9200.o
obj-$(CONFIG_SOC_AT91SAM9) += at91sam9260.o at91sam9rl.o at91sam9x5.o
obj-$(CONFIG_SOC_SAM9X60) += sam9x60.o
obj-$(CONFIG_SOC_SAMA5D4) += sama5d4.o
diff --git a/drivers/clk/at91/at91rm9200.c b/drivers/clk/at91/at91rm9200.c
new file mode 100644
index 000000000000..90b2ace7f7bd
--- /dev/null
+++ b/drivers/clk/at91/at91rm9200.c
@@ -0,0 +1,199 @@
+// 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"
+
+struct sck {
+ char *n;
+ char *p;
+ u8 id;
+};
+
+struct pck {
+ char *n;
+ u8 id;
+};
+
+static const struct clk_master_characteristics rm9200_mck_characteristics = {
+ .output = { .min = 0, .max = 80000000 },
+ .divisors = { 1, 2, 3, 4 },
+};
+
+static u8 rm9200_pll_out[] = { 0, 2 };
+
+static const struct clk_range rm9200_pll_outputs[] = {
+ { .min = 80000000, .max = 160000000 },
+ { .min = 150000000, .max = 180000000 },
+};
+
+static const struct clk_pll_characteristics rm9200_pll_characteristics = {
+ .input = { .min = 1000000, .max = 32000000 },
+ .num_output = ARRAY_SIZE(rm9200_pll_outputs),
+ .output = rm9200_pll_outputs,
+ .out = rm9200_pll_out,
+};
+
+static const struct sck at91rm9200_systemck[] = {
+ { .n = "udpck", .p = "usbck", .id = 2 },
+ { .n = "uhpck", .p = "usbck", .id = 4 },
+ { .n = "pck0", .p = "prog0", .id = 8 },
+ { .n = "pck1", .p = "prog1", .id = 9 },
+ { .n = "pck2", .p = "prog2", .id = 10 },
+ { .n = "pck3", .p = "prog3", .id = 11 },
+};
+
+static const struct pck at91rm9200_periphck[] = {
+ { .n = "pioA_clk", .id = 2 },
+ { .n = "pioB_clk", .id = 3 },
+ { .n = "pioC_clk", .id = 4 },
+ { .n = "pioD_clk", .id = 5 },
+ { .n = "usart0_clk", .id = 6 },
+ { .n = "usart1_clk", .id = 7 },
+ { .n = "usart2_clk", .id = 8 },
+ { .n = "usart3_clk", .id = 9 },
+ { .n = "mci0_clk", .id = 10 },
+ { .n = "udc_clk", .id = 11 },
+ { .n = "twi0_clk", .id = 12 },
+ { .n = "spi0_clk", .id = 13 },
+ { .n = "ssc0_clk", .id = 14 },
+ { .n = "ssc1_clk", .id = 15 },
+ { .n = "ssc2_clk", .id = 16 },
+ { .n = "tc0_clk", .id = 17 },
+ { .n = "tc1_clk", .id = 18 },
+ { .n = "tc2_clk", .id = 19 },
+ { .n = "tc3_clk", .id = 20 },
+ { .n = "tc4_clk", .id = 21 },
+ { .n = "tc5_clk", .id = 22 },
+ { .n = "ohci_clk", .id = 23 },
+ { .n = "macb0_clk", .id = 24 },
+};
+
+static void __init at91rm9200_pmc_setup(struct device_node *np)
+{
+ const char *slowxtal_name, *mainxtal_name;
+ struct pmc_data *at91rm9200_pmc;
+ u32 usb_div[] = { 1, 2, 0, 0 };
+ const char *parent_names[6];
+ struct regmap *regmap;
+ struct clk_hw *hw;
+ int i;
+ bool bypass;
+
+ i = of_property_match_string(np, "clock-names", "slow_xtal");
+ if (i < 0)
+ return;
+
+ slowxtal_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 = device_node_to_regmap(np);
+ if (IS_ERR(regmap))
+ return;
+
+ at91rm9200_pmc = pmc_data_allocate(PMC_MAIN + 1,
+ nck(at91rm9200_systemck),
+ nck(at91rm9200_periphck), 0);
+ if (!at91rm9200_pmc)
+ return;
+
+ 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;
+
+ hw = at91_clk_register_rm9200_main(regmap, "mainck", "main_osc");
+ if (IS_ERR(hw))
+ goto err_free;
+
+ at91rm9200_pmc->chws[PMC_MAIN] = hw;
+
+ hw = at91_clk_register_pll(regmap, "pllack", "mainck", 0,
+ &at91rm9200_pll_layout,
+ &rm9200_pll_characteristics);
+ if (IS_ERR(hw))
+ goto err_free;
+
+ hw = at91_clk_register_pll(regmap, "pllbck", "mainck", 1,
+ &at91rm9200_pll_layout,
+ &rm9200_pll_characteristics);
+ if (IS_ERR(hw))
+ goto err_free;
+
+ parent_names[0] = slowxtal_name;
+ parent_names[1] = "mainck";
+ parent_names[2] = "pllack";
+ parent_names[3] = "pllbck";
+ hw = at91_clk_register_master(regmap, "masterck", 4, parent_names,
+ &at91rm9200_master_layout,
+ &rm9200_mck_characteristics);
+ if (IS_ERR(hw))
+ goto err_free;
+
+ at91rm9200_pmc->chws[PMC_MCK] = hw;
+
+ hw = at91rm9200_clk_register_usb(regmap, "usbck", "pllbck", usb_div);
+ if (IS_ERR(hw))
+ goto err_free;
+
+ parent_names[0] = slowxtal_name;
+ parent_names[1] = "mainck";
+ parent_names[2] = "pllack";
+ parent_names[3] = "pllbck";
+ for (i = 0; i < 4; i++) {
+ char name[6];
+
+ snprintf(name, sizeof(name), "prog%d", i);
+
+ hw = at91_clk_register_programmable(regmap, name,
+ parent_names, 4, i,
+ &at91rm9200_programmable_layout);
+ if (IS_ERR(hw))
+ goto err_free;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(at91rm9200_systemck); i++) {
+ hw = at91_clk_register_system(regmap, at91rm9200_systemck[i].n,
+ at91rm9200_systemck[i].p,
+ at91rm9200_systemck[i].id);
+ if (IS_ERR(hw))
+ goto err_free;
+
+ at91rm9200_pmc->shws[at91rm9200_systemck[i].id] = hw;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(at91rm9200_periphck); i++) {
+ hw = at91_clk_register_peripheral(regmap,
+ at91rm9200_periphck[i].n,
+ "masterck",
+ at91rm9200_periphck[i].id);
+ if (IS_ERR(hw))
+ goto err_free;
+
+ at91rm9200_pmc->phws[at91rm9200_periphck[i].id] = hw;
+ }
+
+ of_clk_add_hw_provider(np, of_clk_hw_pmc_get, at91rm9200_pmc);
+
+ return;
+
+err_free:
+ pmc_data_free(at91rm9200_pmc);
+}
+/*
+ * While the TCB can be used as the clocksource, the system timer is most likely
+ * to be used instead. However, the pinctrl driver doesn't support probe
+ * deferring properly. Once this is fixed, this can be switched to a platform
+ * driver.
+ */
+CLK_OF_DECLARE_DRIVER(at91rm9200_pmc, "atmel,at91rm9200-pmc",
+ at91rm9200_pmc_setup);
--
2.24.1
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