[PATCH V4 3/7] clk: bcm2835: remove use of BCM2835_CLOCK_COUNT in driver
kernel at martin.sperl.org
kernel at martin.sperl.org
Fri Jan 15 06:21:02 PST 2016
From: Martin Sperl <kernel at martin.sperl.org>
As the use of BCM2835_CLOCK_COUNT in
include/dt-bindings/clock/bcm2835.h is frowned upon as
it needs to get modified every time a new clock gets introduced
this patch changes the clk-bcm2835 driver to use a different
scheme for registration of clocks and pll, so that there
is no more need for BCM2835_CLOCK_COUNT to be defined.
Signed-off-by: Martin Sperl <kernel at martin.sperl.org>
---
drivers/clk/bcm/clk-bcm2835.c | 167 ++++++++++++++++++++---------------
include/dt-bindings/clock/bcm2835.h | 2 -
2 files changed, 94 insertions(+), 75 deletions(-)
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index 3d6490f..567c265 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -288,7 +288,7 @@ struct bcm2835_cprman {
const char *osc_name;
struct clk_onecell_data onecell;
- struct clk *clks[BCM2835_CLOCK_COUNT];
+ struct clk *clks[];
};
static inline void cprman_write(struct bcm2835_cprman *cprman, u32 reg, u32 val)
@@ -817,6 +817,25 @@ static const struct bcm2835_clock_data bcm2835_clock_pwm_data = {
.frac_bits = 12,
};
+struct bcm2835_gate_data {
+ const char *name;
+ const char *parent;
+
+ u32 ctl_reg;
+};
+
+/*
+ * CM_PERIICTL (and CM_PERIACTL, CM_SYSCTL and CM_VPUCTL if
+ * you have the debug bit set in the power manager, which we
+ * don't bother exposing) are individual gates off of the
+ * non-stop vpu clock.
+ */
+static const struct bcm2835_gate_data bcm2835_clock_peri_image_data = {
+ .name = "peri_image",
+ .parent = "vpu",
+ .ctl_reg = CM_PERIICTL,
+};
+
struct bcm2835_pll {
struct clk_hw hw;
struct bcm2835_cprman *cprman;
@@ -1502,14 +1521,81 @@ static struct clk *bcm2835_register_clock(struct bcm2835_cprman *cprman,
return devm_clk_register(cprman->dev, &clock->hw);
}
+static struct clk *bcm2835_register_gate(struct bcm2835_cprman *cprman,
+ const struct bcm2835_gate_data *data)
+{
+ return clk_register_gate(cprman->dev, data->name, data->parent,
+ CLK_IGNORE_UNUSED | CLK_SET_RATE_GATE,
+ cprman->regs + data->ctl_reg,
+ CM_GATE_BIT, 0, &cprman->regs_lock);
+}
+
+typedef struct clk *(*bcm2835_clk_register)(struct bcm2835_cprman *cprman,
+ const void *data);
+struct bcm2835_clk_desc {
+ bcm2835_clk_register clk_register;
+ const void *data;
+};
+
+#define _REGISTER(f, d) { .clk_register = (bcm2835_clk_register)f, \
+ .data = d }
+#define REGISTER_PLL(d) _REGISTER(&bcm2835_register_pll, d)
+#define REGISTER_PLL_DIV(d) _REGISTER(&bcm2835_register_pll_divider, d)
+#define REGISTER_CLK(d) _REGISTER(&bcm2835_register_clock, d)
+#define REGISTER_GATE(d) _REGISTER(&bcm2835_register_gate, d)
+
+static const struct bcm2835_clk_desc clk_desc_array[] = {
+ /* register PLL */
+ [BCM2835_PLLA] = REGISTER_PLL(&bcm2835_plla_data),
+ [BCM2835_PLLB] = REGISTER_PLL(&bcm2835_pllb_data),
+ [BCM2835_PLLC] = REGISTER_PLL(&bcm2835_pllc_data),
+ [BCM2835_PLLD] = REGISTER_PLL(&bcm2835_plld_data),
+ [BCM2835_PLLH] = REGISTER_PLL(&bcm2835_pllh_data),
+ /* the PLL dividers */
+ [BCM2835_PLLA_CORE] = REGISTER_PLL_DIV(&bcm2835_plla_core_data),
+ [BCM2835_PLLA_PER] = REGISTER_PLL_DIV(&bcm2835_plla_per_data),
+ [BCM2835_PLLC_CORE0] = REGISTER_PLL_DIV(&bcm2835_pllc_core0_data),
+ [BCM2835_PLLC_CORE1] = REGISTER_PLL_DIV(&bcm2835_pllc_core1_data),
+ [BCM2835_PLLC_CORE2] = REGISTER_PLL_DIV(&bcm2835_pllc_core2_data),
+ [BCM2835_PLLC_PER] = REGISTER_PLL_DIV(&bcm2835_pllc_per_data),
+ [BCM2835_PLLD_CORE] = REGISTER_PLL_DIV(&bcm2835_plld_core_data),
+ [BCM2835_PLLD_PER] = REGISTER_PLL_DIV(&bcm2835_plld_per_data),
+ [BCM2835_PLLH_RCAL] = REGISTER_PLL_DIV(&bcm2835_pllh_rcal_data),
+ [BCM2835_PLLH_AUX] = REGISTER_PLL_DIV(&bcm2835_pllh_aux_data),
+ [BCM2835_PLLH_PIX] = REGISTER_PLL_DIV(&bcm2835_pllh_pix_data),
+ /* the clocks */
+ [BCM2835_CLOCK_TIMER] = REGISTER_CLK(&bcm2835_clock_timer_data),
+ [BCM2835_CLOCK_OTP] = REGISTER_CLK(&bcm2835_clock_otp_data),
+ [BCM2835_CLOCK_TSENS] = REGISTER_CLK(&bcm2835_clock_tsens_data),
+ [BCM2835_CLOCK_VPU] = REGISTER_CLK(&bcm2835_clock_vpu_data),
+ [BCM2835_CLOCK_V3D] = REGISTER_CLK(&bcm2835_clock_v3d_data),
+ [BCM2835_CLOCK_ISP] = REGISTER_CLK(&bcm2835_clock_isp_data),
+ [BCM2835_CLOCK_H264] = REGISTER_CLK(&bcm2835_clock_h264_data),
+ [BCM2835_CLOCK_V3D] = REGISTER_CLK(&bcm2835_clock_v3d_data),
+ [BCM2835_CLOCK_SDRAM] = REGISTER_CLK(&bcm2835_clock_sdram_data),
+ [BCM2835_CLOCK_UART] = REGISTER_CLK(&bcm2835_clock_uart_data),
+ [BCM2835_CLOCK_VEC] = REGISTER_CLK(&bcm2835_clock_vec_data),
+ [BCM2835_CLOCK_HSM] = REGISTER_CLK(&bcm2835_clock_hsm_data),
+ [BCM2835_CLOCK_EMMC] = REGISTER_CLK(&bcm2835_clock_emmc_data),
+ [BCM2835_CLOCK_PWM] = REGISTER_CLK(&bcm2835_clock_pwm_data),
+ /* the gates */
+ [BCM2835_CLOCK_PERI_IMAGE] = REGISTER_GATE(
+ &bcm2835_clock_peri_image_data),
+};
+
static int bcm2835_clk_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct clk **clks;
struct bcm2835_cprman *cprman;
struct resource *res;
+ const struct bcm2835_clk_desc *desc;
+ const size_t asize = ARRAY_SIZE(clk_desc_array);
+ size_t i;
- cprman = devm_kzalloc(dev, sizeof(*cprman), GFP_KERNEL);
+ cprman = devm_kzalloc(dev,
+ sizeof(*cprman) + asize * sizeof(*clks),
+ GFP_KERNEL);
if (!cprman)
return -ENOMEM;
@@ -1526,80 +1612,15 @@ static int bcm2835_clk_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, cprman);
- cprman->onecell.clk_num = BCM2835_CLOCK_COUNT;
+ cprman->onecell.clk_num = asize;
cprman->onecell.clks = cprman->clks;
clks = cprman->clks;
- clks[BCM2835_PLLA] = bcm2835_register_pll(cprman, &bcm2835_plla_data);
- clks[BCM2835_PLLB] = bcm2835_register_pll(cprman, &bcm2835_pllb_data);
- clks[BCM2835_PLLC] = bcm2835_register_pll(cprman, &bcm2835_pllc_data);
- clks[BCM2835_PLLD] = bcm2835_register_pll(cprman, &bcm2835_plld_data);
- clks[BCM2835_PLLH] = bcm2835_register_pll(cprman, &bcm2835_pllh_data);
-
- clks[BCM2835_PLLA_CORE] =
- bcm2835_register_pll_divider(cprman, &bcm2835_plla_core_data);
- clks[BCM2835_PLLA_PER] =
- bcm2835_register_pll_divider(cprman, &bcm2835_plla_per_data);
- clks[BCM2835_PLLC_CORE0] =
- bcm2835_register_pll_divider(cprman, &bcm2835_pllc_core0_data);
- clks[BCM2835_PLLC_CORE1] =
- bcm2835_register_pll_divider(cprman, &bcm2835_pllc_core1_data);
- clks[BCM2835_PLLC_CORE2] =
- bcm2835_register_pll_divider(cprman, &bcm2835_pllc_core2_data);
- clks[BCM2835_PLLC_PER] =
- bcm2835_register_pll_divider(cprman, &bcm2835_pllc_per_data);
- clks[BCM2835_PLLD_CORE] =
- bcm2835_register_pll_divider(cprman, &bcm2835_plld_core_data);
- clks[BCM2835_PLLD_PER] =
- bcm2835_register_pll_divider(cprman, &bcm2835_plld_per_data);
- clks[BCM2835_PLLH_RCAL] =
- bcm2835_register_pll_divider(cprman, &bcm2835_pllh_rcal_data);
- clks[BCM2835_PLLH_AUX] =
- bcm2835_register_pll_divider(cprman, &bcm2835_pllh_aux_data);
- clks[BCM2835_PLLH_PIX] =
- bcm2835_register_pll_divider(cprman, &bcm2835_pllh_pix_data);
-
- clks[BCM2835_CLOCK_TIMER] =
- bcm2835_register_clock(cprman, &bcm2835_clock_timer_data);
- clks[BCM2835_CLOCK_OTP] =
- bcm2835_register_clock(cprman, &bcm2835_clock_otp_data);
- clks[BCM2835_CLOCK_TSENS] =
- bcm2835_register_clock(cprman, &bcm2835_clock_tsens_data);
- clks[BCM2835_CLOCK_VPU] =
- bcm2835_register_clock(cprman, &bcm2835_clock_vpu_data);
- clks[BCM2835_CLOCK_V3D] =
- bcm2835_register_clock(cprman, &bcm2835_clock_v3d_data);
- clks[BCM2835_CLOCK_ISP] =
- bcm2835_register_clock(cprman, &bcm2835_clock_isp_data);
- clks[BCM2835_CLOCK_H264] =
- bcm2835_register_clock(cprman, &bcm2835_clock_h264_data);
- clks[BCM2835_CLOCK_V3D] =
- bcm2835_register_clock(cprman, &bcm2835_clock_v3d_data);
- clks[BCM2835_CLOCK_SDRAM] =
- bcm2835_register_clock(cprman, &bcm2835_clock_sdram_data);
- clks[BCM2835_CLOCK_UART] =
- bcm2835_register_clock(cprman, &bcm2835_clock_uart_data);
- clks[BCM2835_CLOCK_VEC] =
- bcm2835_register_clock(cprman, &bcm2835_clock_vec_data);
- clks[BCM2835_CLOCK_HSM] =
- bcm2835_register_clock(cprman, &bcm2835_clock_hsm_data);
- clks[BCM2835_CLOCK_EMMC] =
- bcm2835_register_clock(cprman, &bcm2835_clock_emmc_data);
-
- /*
- * CM_PERIICTL (and CM_PERIACTL, CM_SYSCTL and CM_VPUCTL if
- * you have the debug bit set in the power manager, which we
- * don't bother exposing) are individual gates off of the
- * non-stop vpu clock.
- */
- clks[BCM2835_CLOCK_PERI_IMAGE] =
- clk_register_gate(dev, "peri_image", "vpu",
- CLK_IGNORE_UNUSED | CLK_SET_RATE_GATE,
- cprman->regs + CM_PERIICTL, CM_GATE_BIT,
- 0, &cprman->regs_lock);
-
- clks[BCM2835_CLOCK_PWM] =
- bcm2835_register_clock(cprman, &bcm2835_clock_pwm_data);
+ for (i = 0; i < asize; i++) {
+ desc = &clk_desc_array[i];
+ if (desc->clk_register && desc->data)
+ clks[i] = desc->clk_register(cprman, desc->data);
+ }
return of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
&cprman->onecell);
diff --git a/include/dt-bindings/clock/bcm2835.h b/include/dt-bindings/clock/bcm2835.h
index 61f1d20..87235ac 100644
--- a/include/dt-bindings/clock/bcm2835.h
+++ b/include/dt-bindings/clock/bcm2835.h
@@ -44,5 +44,3 @@
#define BCM2835_CLOCK_EMMC 28
#define BCM2835_CLOCK_PERI_IMAGE 29
#define BCM2835_CLOCK_PWM 30
-
-#define BCM2835_CLOCK_COUNT 31
--
1.7.10.4
More information about the linux-arm-kernel
mailing list