[alsa-devel] [PATCH 9/9] ASoC: rsnd: add AUDIO_CLKOUT support
Kuninori Morimoto
kuninori.morimoto.gx at renesas.com
Thu Sep 10 09:04:45 CEST 2015
From: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
Renesas sound has AUDIO_CLKOUT (in Gen1/Gen2) AUDIO_CLKOUT1/2/3 (in Gen3)
This patch support these patches as clock provider.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
.../devicetree/bindings/sound/renesas,rsnd.txt | 3 +
sound/soc/sh/rcar/adg.c | 98 +++++++++++++++++++++-
2 files changed, 97 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
index bf6fd1a..c57cbd6 100644
--- a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
+++ b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
@@ -34,6 +34,9 @@ Required properties:
see below for detail.
- #sound-dai-cells : it must be 0 if your system is using single DAI
it must be 1 if your system is using multi DAI
+- #clock-cells : it must be 0 if your system has audio_clkout
+ it must be 1 if your system has audio_clkout0/1/2/3
+- clock-frequency : for all audio_clkout0/1/2/3
SSI subnode properties:
- interrupts : Should contain SSI interrupt for PIO transfer
diff --git a/sound/soc/sh/rcar/adg.c b/sound/soc/sh/rcar/adg.c
index d4fb11a..3fecb87 100644
--- a/sound/soc/sh/rcar/adg.c
+++ b/sound/soc/sh/rcar/adg.c
@@ -7,6 +7,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
+#include <linux/clk-provider.h>
#include "rsnd.h"
#define CLKA 0
@@ -15,6 +16,12 @@
#define CLKI 3
#define CLKMAX 4
+#define CLKOUT 0
+#define CLKOUT1 1
+#define CLKOUT2 2
+#define CLKOUT3 3
+#define CLKOUTMAX 4
+
#define BRRx_MASK(x) (0x3FF & x)
static struct rsnd_mod_ops adg_ops = {
@@ -23,6 +30,8 @@ static struct rsnd_mod_ops adg_ops = {
struct rsnd_adg {
struct clk *clk[CLKMAX];
+ struct clk *clkout[CLKOUTMAX];
+ struct clk_onecell_data onecell;
struct rsnd_mod mod;
int rbga_rate_for_441khz; /* RBGA */
@@ -34,6 +43,11 @@ struct rsnd_adg {
(i < CLKMAX) && \
((pos) = adg->clk[i]); \
i++)
+#define for_each_rsnd_clkout(pos, adg, i) \
+ for (i = 0; \
+ (i < CLKOUTMAX) && \
+ ((pos) = adg->clkout[i]); \
+ i++)
#define rsnd_priv_to_adg(priv) ((struct rsnd_adg *)(priv)->adg)
static u32 rsnd_adg_calculate_rbgx(unsigned long div)
@@ -416,14 +430,25 @@ static void rsnd_adg_get_clkin(struct rsnd_priv *priv,
dev_dbg(dev, "clk %d : %p : %ld\n", i, clk, clk_get_rate(clk));
}
-static void rsnd_adg_ssi_clk_init(struct rsnd_priv *priv, struct rsnd_adg *adg)
+static void rsnd_adg_get_clkout(struct rsnd_priv *priv,
+ struct rsnd_adg *adg)
{
struct clk *clk;
struct rsnd_mod *adg_mod = rsnd_mod_get(adg);
struct device *dev = rsnd_priv_to_dev(priv);
- unsigned long rate, div;
+ struct device_node *np = dev->of_node;
u32 ckr, rbgx, rbga, rbgb;
+ u32 rate, req_rate, div;
+ uint32_t count = 0;
+ unsigned long req_48kHz_rate, req_441kHz_rate;
int i;
+ const char *parent_clk_name = NULL;
+ static const char * const clkout_name[] = {
+ [CLKOUT] = "audio_clkout",
+ [CLKOUT1] = "audio_clkout1",
+ [CLKOUT2] = "audio_clkout2",
+ [CLKOUT3] = "audio_clkout3",
+ };
int brg_table[] = {
[CLKA] = 0x0,
[CLKB] = 0x1,
@@ -431,6 +456,20 @@ static void rsnd_adg_ssi_clk_init(struct rsnd_priv *priv, struct rsnd_adg *adg)
[CLKI] = 0x2,
};
+ of_property_read_u32(np, "#clock-cells", &count);
+
+ /*
+ * ADG supports BRRA/BRRB output only
+ * this means all clkout0/1/2/3 will be same rate
+ */
+ of_property_read_u32(np, "clock-frequency", &req_rate);
+ req_48kHz_rate = 0;
+ req_441kHz_rate = 0;
+ if (0 == (req_rate % 44100))
+ req_441kHz_rate = req_rate;
+ if (0 == (req_rate % 48000))
+ req_48kHz_rate = req_rate;
+
/*
* This driver is assuming that AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC
* have 44.1kHz or 48kHz base clocks for now.
@@ -454,22 +493,72 @@ static void rsnd_adg_ssi_clk_init(struct rsnd_priv *priv, struct rsnd_adg *adg)
/* RBGA */
if (!adg->rbga_rate_for_441khz && (0 == rate % 44100)) {
div = 6;
+ if (req_441kHz_rate)
+ div = rate / req_441kHz_rate;
rbgx = rsnd_adg_calculate_rbgx(div);
if (BRRx_MASK(rbgx) == rbgx) {
rbga = rbgx;
adg->rbga_rate_for_441khz = rate / div;
ckr |= brg_table[i] << 20;
+ if (req_441kHz_rate)
+ parent_clk_name = __clk_get_name(clk);
}
}
/* RBGB */
if (!adg->rbgb_rate_for_48khz && (0 == rate % 48000)) {
div = 6;
+ if (req_48kHz_rate)
+ div = rate / req_48kHz_rate;
rbgx = rsnd_adg_calculate_rbgx(div);
if (BRRx_MASK(rbgx) == rbgx) {
rbgb = rbgx;
adg->rbgb_rate_for_48khz = rate / div;
ckr |= brg_table[i] << 16;
+ if (req_48kHz_rate) {
+ parent_clk_name = __clk_get_name(clk);
+ ckr |= 0x80000000;
+ }
+ }
+ }
+ }
+
+ /*
+ * ADG supports BRRA/BRRB output only.
+ * this means all clkout0/1/2/3 will be * same rate
+ */
+
+ /*
+ * for clkout
+ */
+ if (!count) {
+ clk = clk_register_fixed_rate(dev, clkout_name[i],
+ parent_clk_name,
+ (parent_clk_name) ?
+ 0 : CLK_IS_ROOT, req_rate);
+ if (!IS_ERR(clk)) {
+ adg->clkout[CLKOUT] = clk;
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ }
+ }
+ /*
+ * for clkout0/1/2/3
+ */
+ else {
+ for (i = 0; i < CLKOUTMAX; i++) {
+ clk = clk_register_fixed_rate(dev, clkout_name[i],
+ parent_clk_name,
+ (parent_clk_name) ?
+ 0 : CLK_IS_ROOT,
+ req_rate);
+ if (!IS_ERR(clk)) {
+ adg->onecell.clks = adg->clkout;
+ adg->onecell.clk_num = CLKOUTMAX;
+
+ adg->clkout[i] = clk;
+
+ of_clk_add_provider(np, of_clk_src_onecell_get,
+ &adg->onecell);
}
}
}
@@ -478,6 +567,8 @@ static void rsnd_adg_ssi_clk_init(struct rsnd_priv *priv, struct rsnd_adg *adg)
rsnd_mod_write(adg_mod, BRRA, rbga);
rsnd_mod_write(adg_mod, BRRB, rbgb);
+ for_each_rsnd_clkout(clk, adg, i)
+ dev_dbg(dev, "clkout %d : %p : %ld\n", i, clk, clk_get_rate(clk));
dev_dbg(dev, "SSICKR = 0x%08x, BRRA/BRRB = 0x%x/0x%x\n",
ckr, rbga, rbgb);
}
@@ -504,8 +595,7 @@ int rsnd_adg_probe(struct platform_device *pdev,
adg->mod.priv = priv;
rsnd_adg_get_clkin(priv, adg);
-
- rsnd_adg_ssi_clk_init(priv, adg);
+ rsnd_adg_get_clkout(priv, adg);
priv->adg = adg;
--
1.9.1
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