pwm: meson: Add compatible for the gxbb ao PWMs

On the gxbb (and gxl) family, the PWMs of the AO domain require a
specific compatible because the possible input clocks are different
from the EE PWMs input clocks.

Since the number of possible input clocks is also different, the
'num_parents' field is added to all the Meson PWM data.

Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 29 insertions, 3 deletions

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 045ef9fa6fe3..defc27d880f3 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -103,6 +103,7 @@ struct meson_pwm_channel {
 
 struct meson_pwm_data {
         const char * const *parent_names;
+        unsigned int num_parents;
 };
 
 struct meson_pwm {
@@ -381,6 +382,7 @@ static const char * const pwm_meson8b_parent_names[] = {
 
 static const struct meson_pwm_data pwm_meson8b_data = {
         .parent_names = pwm_meson8b_parent_names,
+        .num_parents = ARRAY_SIZE(pwm_meson8b_parent_names),
 };
 
 static const char * const pwm_gxbb_parent_names[] = {
@@ -389,11 +391,35 @@ static const char * const pwm_gxbb_parent_names[] = {
 
 static const struct meson_pwm_data pwm_gxbb_data = {
         .parent_names = pwm_gxbb_parent_names,
+        .num_parents = ARRAY_SIZE(pwm_gxbb_parent_names),
+};
+
+/*
+ * Only the 2 first inputs of the GXBB AO PWMs are valid
+ * The last 2 are grounded
+ */
+static const char * const pwm_gxbb_ao_parent_names[] = {
+        "xtal", "clk81"
+};
+
+static const struct meson_pwm_data pwm_gxbb_ao_data = {
+        .parent_names = pwm_gxbb_ao_parent_names,
+        .num_parents = ARRAY_SIZE(pwm_gxbb_ao_parent_names),
 };
 
 static const struct of_device_id meson_pwm_matches[] = {
-        { .compatible = "amlogic,meson8b-pwm", .data = &pwm_meson8b_data },
-        { .compatible = "amlogic,meson-gxbb-pwm", .data = &pwm_gxbb_data },
+        {
+                .compatible = "amlogic,meson8b-pwm",
+                .data = &pwm_meson8b_data
+        },
+        {
+                .compatible = "amlogic,meson-gxbb-pwm",
+                .data = &pwm_gxbb_data
+        },
+        {
+                .compatible = "amlogic,meson-gxbb-ao-pwm",
+                .data = &pwm_gxbb_ao_data
+        },
         {},
 };
 MODULE_DEVICE_TABLE(of, meson_pwm_matches);
@@ -417,7 +443,7 @@ static int meson_pwm_init_channels(struct meson_pwm *meson,
                 init.ops = &clk_mux_ops;
                 init.flags = CLK_IS_BASIC;
                 init.parent_names = meson->data->parent_names;
-                init.num_parents = 1 << MISC_CLK_SEL_WIDTH;
+                init.num_parents = meson->data->num_parents;
 
                 channel->mux.reg = meson->base + REG_MISC_AB;
                 channel->mux.shift = mux_reg_shifts[i];